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WWII M21 Practice Grenades Mk2

Kilroy was Here

Well-Known Member
Hi, here's something that might be of interest to WW2 MkII collectors. I have shown before the one M21 on the left in the photos and it fueled a nice discussion about the dates and times of the introduction of the M21, and also a discussion about the odd blue color. Now I have two M21's, and both of these are very close to the same color blue, and they are not the typical lighter blue seen on many WW2 trainers.

I have just got a few months ago got another 1944 date M21 from the same friend I got the first M21 from on left about a year and a half ago.
I asked my friend what history and what the story is with these, and where he had got both of these grenades. First, I will say he lives in the same city were I was born and raised...Los Angeles.

He told me that almost 40 years ago he stopped at one of his favorite Army Surplus stores in the Sun Valley area in the San Fernando Valley (where I grew up) and he was outside in the huge area where there was surplus electronics, cabinets, desks, and other items that were large that were stored outside in the open basically.
He said he had been looking around through all this surplus "junk" and noticed something in a dumpster that he was after, some type of aluminum box he was looking for, and when he looked in the dumpster there were some boxes that had been rained on, falling apart and being thrown out. He noticed something blue, and opened boxes and there were many of these M41 grenade cans all wet and falling apart. He looked at them all and found only 4 of the grenade cans that had not been damaged and were still sealed. All the other grenades were badly rusted and the containers were ruined and falling apart from being wet for so long.

Anyway this is the story where these two M21's have come from. I believe my friend 100% because I know this Surplus store, I used to go there myself 40 years ago, and I also know he has no reason to make up a story like this. He had 4 M21's like this originally, sold 2 many years ago, kept these two best ones for many years, and has now sold them both to me for safe keeping. :tinysmile_grin_t:

The grenade on the right was the one he had kept for himself until a few month ago when he sold it to me. These two grenades have different bodies, one is a late WWI narrow base, round shouldered body that has a 9/16 threaded hole on the bottom. The other grenade has more squared segments, and has an off center hole drilled with chamfered edge.

These off center chamfered hole WW2 practice grenades I was told by an advanced Mk2 collector, that they were originally grenade bodies that had the filler plug threads, and that the threads were drilled out, and these grenades always have the off center hole with chamfered edge for some reason. I believe this true as he had an example that he showed me that was not drilled completely and you could just slightly see where the threads were on one side of the hole. I have also seen dozens of these WW2 blue practice grenades that have this off centered hole.

I know I am typing a bit to much, but one more thing I have noticed, the can on right has different markings on top and bottom of can. But this is an original can that was taped closed until my friend opened it to look at grenade 40 years ago? Strange.
By the way, both grenades were originally sealed in the cans without fuzes, so I have added both M10A3 fuzes for the photos and to display them.
 

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Awesome stuff Steve, I for one just got an education on the MKII which I imagine there will be a few in my collection before I meet my maker. I would especially like to find a late WW1 narrow based MKII for my collection. Am I correct in assuming that the narrow based MKII's are most likely late WW1. One thing that puzzles me and I hope I am not getting too far off subject here. The throwing dummy MK1 that has the swivel type handle. Why do these grenades have the 5 rows of segments yet the swivel handle. To me that just don't fit. i would seem to make much more sense that the swivel handle would be used on the 4 row segment body. Does anyone have an explanation for this. Will add pic of throwing dummy I am talking about. WHY? Well done and thanks....Dano
 
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Awesome stuff Steve, I for one just got an education on the MKII which I imagine there will be a few in my collection before I meet my maker. Well done and thanks....Dano


Hi Dano Thanks. I think it's hard to follow what I'm saying sometimes with the long posts though. :tinysmile_sleep_t: it puts people to sleep I think....haha
 
Picture of WW1 MK1 throwing dummy

I think the picture says it all. It is the WW1 MKI throwing dummy obviously with the swivel type handle. I just don't get why the 5 segment body when all logic would dictate that it be a 4 row body. I just don't get it. Obviously I am talking about grenade on left.........Dano
 

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I think the picture says it all. It is the WW1 MKI throwing dummy obviously with the swivel type handle. I just don't get why the 5 segment body when all logic would dictate that it be a 4 row body. I just don't get it. Obviously I am talking about grenade on left.........Dano


That is strange that the MkI throwing dummies have 40 segments instead of 32 like it should be with a HE side swing/swivel fuze MkI grenade. My MkI dummy is the same way. They maybe got caught in a transitional stage of the twilight zone of grenade casting. :tinysmile_hmm_t:
 
Yes Steve, It has puzzled me for quite some time. I don't think the answer will be found written anywhere. In ordnance collecting and many other hobbies as well you seem to run across the occasional puzzler. There is a 4 row throwing dummy (I think Chas. Wilson Sporting Goods or something along that line). That particular thrower is rarer than hens teeth. Paul the Grenade has a fine example in his collection. Think I remember that they were actually part of a pitching game of sorts. It was mentioned in another thread, but I looked in archives and could not find it to save my life. Yep 5 row segment with a swivel style handle is a question we may never know the answer. I am really developing an appreciation for U.S. grenades and may acquire some examples through trading and such. I've enjoyed the hell out of this thread and if anyone can add/subtract from what has already been discussed it would certainly be greatly appreciated. In Vietnam era grenades there sure a lot of "fish to fry" and adding to that catagory with my German WW1 speciality will certainly be fun and interesting. i have learned so much, but still not near the tip of the
proverbial iceberg. All BOCN members have been so helpful and BOCN has more resources than a library filled with books. The endless supply of human knowledge simply cannot be matched. I enjoy the thirst for knowledge, the hunt and eventual acquisition as much as any other part of the hobby. A great "thanks" to all........Dano
 
Here, Here. I second that. I've learned all kinds of things here on BOCN. Every time I log in, I learn something new. The forum and the members here are the greatest. I've also made some nice friends here. Ordnance collectors are really a crazy and nice bunch of fellows.
 
Here, Here. I second that. I've learned all kinds of things here on BOCN. Every time I log in, I learn something new. The forum and the members here are the greatest. I've also made some nice friends here. Ordnance collectors are really a crazy and nice bunch of fellows.
I second that motion...................Dano
 
Hi Dano Thanks. I think it's hard to follow what I'm saying sometimes with the long posts though. :tinysmile_sleep_t: it puts people to sleep I think....haha

You are totally right, Steve, I have read the post four times and I still cant find the question. :tinysmile_eyebrow_t
 
That is strange that the MkI throwing dummies have 40 segments instead of 32 like it should be with a HE side swing/swivel fuze MkI grenade. My MkI dummy is the same way. They maybe got caught in a transitional stage of the twilight zone of grenade casting. :tinysmile_hmm_t:

All dummies with spoon have the 40 segments body, my idea is that they were already made with the new segments pattern after the WWI.
 

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You are totally right, Steve, I have read the post four times and I still cant find the question. :tinysmile_eyebrow_t


I do not think I am asking any questions, I am just telling a story where the grenades have come from originally 40 years ago, and some other observations and information other collectors "might" find interesting..

But then again , they might not :tinysmile_tongue_t: I know it is a long post and could possibly put people to :tinysmile_sleep_t: zzzzz zzzzz zzzz
 
All dummies with spoon have the 40 segments body, my idea is that they were already made with the new segments pattern after the WWI.


Yes, I think so also. There's a very fine time line with the transition period from 32 to 40 segment body.

That's a nice Cricket you have below the grenades Miguel, is that a real Cricket or one of the nice repros they made?
 
I want to say you that you have a very rare blue practice, it has done from a standard HE body and not from the lower quality used for the practice. All blue practice with light blue I found always were from this special type, or from early grenades with thread in the base, just the BB I have as a practice has smooth base hole, but never a standard HE body. The other two are standard early bodies with filler plugs. About cardboard lids there are two types, M41 and M41A1, and is not rare to find them mixed.
 

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Cricket? Whats this?


This is a "cricket" in pic below. In English Miguel, a "cricket" is an "insect" or "Bug" that makes noise at the night time. These "clickers" made a noise that reminded the Allied soldiers of the noise that the Cricket insects make at night, so they called these metal devices ...."Crickets" the "D-Day Cricket"
 

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Ah, yes, I know what they are. No, this one was bought at Normandy at the Pegasus Museum, it is a quality replica with a little book. How much can be paid for a mint original one? I believe the price can be crazy.
 
I want to say you that you have a very rare blue practice, it has done from a standard HE body and not from the lower quality used for the practice. All blue practice with light blue I found always were from this special type, or from early grenades with thread in the base, just the BB I have as a practice has smooth base hole, but never a standard HE body. The other two are standard early bodies with filler plugs. About cardboard lids there are two types, M41 and M41A1, and is not rare to find them mixed.


I think your BB grenade was a supposed to be a HE grenade at one time. They just happened to use that BB grenade body during the war time for a trainer. They did not have any specially made bodies or lower quality bodies that were made "just for training" grenades during WW2. They just used what was needed, and would take HE grenades from stock sometimes, and make them into training grenades. This is what I was saying about the off center drilled holes with the chamfered edge. These types were originally HE grenades that were drilled with a hole.

I think what makes my M21's rare are because of the odd color blue, and the cans with August 1944 date and No lot number. These are probably some the the earliest M21's. We talked about this before Miguel, and you did not think that M21's were made during WW2, remember?
 
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Look carefull the grenade in the middle, with cork in the base. Im agree with the BB one, but with the one in the middle I never seen that body used as a combat grenade. Look the fragments and the quality of the cast. You can ask Jim about this. Also you can see the same grenade here:
http://www.inert-ord.net/usa03a/usa2/mk2sp/index.html
Maybe only one factory was making these grenades, I dont know, but they are pretty different to the HE ones.
About M21 I think I was saying that the designation was not from WWII, not the grenades, or that the most known M21 grenade was the RFX one, I dont remember exactly, but this is not important now as I have the question closed with your two grenades: the name M21 was adopted at the end of the war using WWII grenades, later the RFX body with new fuze was created giving it the M21 name.
 
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Ah, yes, I know what they are. No, this one was bought at Normandy at the Pegasus Museum, it is a quality replica with a little book. How much can be paid for a mint original one? I believe the price can be crazy.


There are too many fake crickets out there. To get one that you know for sure is an original, you would have to get it from the Veteran himself. I would not trust the originality of the crickets for sale online or at military shows. Anything can be aged to look old and original.
 
Look carefull the grenade in the middle, with cork in the base. Im agree with the BB one, but with the one in the middle I never seen that body used as a combat grenade. Look the fragments and the quality of the cast. You can ask Jim about this. Also you can see the same grenade here:
http://www.inert-ord.net/usa03a/usa2/mk2sp/index.html
Maybe only one factory was making these grenades, I dont know, but they are pretty different to the HE ones.
About M21 I think I was saying that the designation was not from WWII, not the grenades, or that the most known M21 grenade was the RFX one, I dont remember exactly, but this is not important now as I have the question closed with your two grenades: the name M21 was adopted at the end of the war using WWII grenades, later the RFX body with new fuze was created giving it the M21 name.


What are the body markings on the grenade in the middle? I do not see any big quality difference in the middle grenade, it is just a different shaped Mk2 body. I think I have seen HE grenades with this same body shape before. What are the marks if any?? Does it have an off centered hole with a chamfered edge? Can you tell with the cork in it?

I do not think that the one you show in the middle is a WW2 era practice grenade. We did not use the yellow varnish to seal the corks during WW2. This body might have a WW2 era M10A3 fuze on it, but these were used also after the war well into Korean era.

I will talk to our friend sometime about this, and check to be sure I am telling the correct info.
 
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