28/20 case query

[SG500]

With the exception of a letter "A" this 28/20 case has no headstamp.
I don't know if the primer goes with the case, it was with it when I got it but it does unscrew so may not be original to the case.
Can anyone give me any information about this case? Does the "A" signify anything?
Is this some sort of development case or were some of the service cases simply made this way?
Thanks.
Dave.

 

[Hoeksel]

I have several German cases, including 2 different experimentals, and I have never seen this stamp. Typically the bottom is flat, here I see mechanical marks reminding me of American cases like the 37 mm cases. I do know the US had 28/20 experiments as well, with the same case dimensions. Could it be US?

 

[SG500]

I have several German cases, including 2 different experimentals, and I have never seen this stamp. Typically the bottom is flat, here I see mechanical marks reminding me of American cases like the 37 mm cases. I do know the US had 28/20 experiments as well, with the same case dimensions. Could it be US?

Thanks, that would make me very happy if it was an American one. Does anyone else know about this case?

Dave.

 

[Alpini]

An american experimental case threaded for a german primer? I think it is a normal german case with the base turned down. The roughness of the turning work and the fact that it was done without automatic cross-feed does not indicate industrial work. You can compare the thickness of your case against an other one (I guess you have some more 28-20-cases to measure )

 

[TimG]

Aren't all German screw in primers of the 'blind cap' variety?

TimG

 

[SG500]

An american experimental case threaded for a german primer? I think it is a normal german case with the base turned down. The roughness of the turning work and the fact that it was done without automatic cross-feed does not indicate industrial work. You can compare the thickness of your case against an other one (I guess you have some more 28-20-cases to measure )

Hi its not been turned down I don't think.
I have measured the rim thicknesses from left to right:
2.88mm
3.04mm
2.89mm
2.90mm
3.02mm (they case in question)

Tim I include a close up of the brass primer next to the type in the remainder of the rounds. Again, I don't know if the primer goes with this case as it can be removed. I'm not a primer expert, what's it for if not this?

Thanks.

Dave.

 

[Alpini]

The C/23 is an electrical primer and wrong for this case.

 

[SG500]

The C/23 is an electrical primer and wrong for this case.

Thanks, that's part of the mystery solved, what is the C/23 primer for?

Dave.

 

[Alpini]

for example the MK101/MK103 30x184B needs a C/23 primer