Unknown primer

[Alpini]

After a long absence from the hobby I want to post this unknown primer for identification. I hope I haven't lost my memory completely during this time because I find it alarming to have a WW1 primer which I am unable to identify

A few of them were found on different places in Germany. Both were demilitarized short after 1st WW under supervision of the Military Inter-Allied Commission of Control. For sure they are from 1st WW.


Overall they have nearly the same size as Krupp primers like C/12 why I put a Krupp primer on the photos for comparsion. But some dimensions are also different:

	Krupp	unknown Type
Diameter	33 mm	33 mm
Thread Size	Withworth 27,3 mm x 18 t.p.i.	Withworth 28,4 mm x 14 t.p.i.
Overall length	18,2 mm	18,7 mm
Base thickness	5 mm	6 mm

Sadly completely unstamped. One more difference to Krupp primers, the base is straight while Krupp primers have a tapered base. I have never seen those two slots for a key which are different from british primers.

All ideas are welcome

 

[AKON_]

Hi Alpini
The first one I found was the standard Krupp with a height of 5 mm—an export drawing.
I have the impression that I’ve seen drawings for other Krupp types as well.
If I can find them...
Akon

 

[AKON_]

HI Alpini
I’ve gone through my drawings, and I have nothing for the sample on the right.
Akon

 

[Alpini]

Hi Akon,

thanks a lot for your research and the beautiful drawing of the standard Krupp primer.

In the meantime a friend found out something very interesting. He found a Krupp primer with 6 mm base thickness and this strange 14 t.p.i. thread. I have never seen a Krupp case with such an unusual primer hole. The turkish text on the primer means "7,5 cm mountain gun". May be there is a connection between both primers and those with two slots may be for Krupp cases. But there is also a difference between both primers, the Krupp primer (left side) has a tapered base but the unknown primer right has a straight base.

Not a positive identification but at least some indications.

 

[AKON_]

Hi Alpini
For sealing gases against leakage, a 14 tpi thread is more advantageous than a 18 tpi pitch. For this, it is possible to take theories from gas tubes and their field ...Therefore, the height of the base is lower and this also affects the construction of the bottom of the cartridge, it is not so massive. It will save material for the production of cartridges. Therefore, the sample will be from development if we do not find serial cartridges with this fine pitch.Also, the conical end is more advantageous for biting the material into itself and thus there is no microscopic gap through which gas can flow, again the experience of an old gas engineer with whom I consulted.
So it's a development progress even if it doesn't look like it...
Akon