Transition from one to two acceptance stamps on Erfurt mag bases
 

Transition from one to two acceptance stamps on Erfurt mag bases
The following Erfurts have a matched Mag:
1914 Erfurt, sn 668, with two acceptance stamps on mag base.
1914 Erfurt, sn 7490, with two acceptance stamps on mag base.(p 73 IL)
1916 Erfurt, sn 4735, with one acceptance stamp on squared end of mag
1916 Erfurt, sn 6843, with two acceptance stamps on mag base (PAOLO).
1916 Erfurt, sn 743d, with one acceptance stamp on squared end of mag base (page 75, Imperial Lugers).
1916 Erfurt, sn 400e 2 matched mags with 1 acceptance stamp on squared bottom of mag base.

The transition from two acceptance stamps to one acceptance stamp took place between serial number 6843 1916 Erfurt and serial number 743d 1916 Erfurt. There is probably some overlap. Does anyone have any observations or records to narrow the gap from two acceptance stamps on the mag botton to one acceptance stamp on the mag bottom?
Thanks
Jan
Note: Years ago I have a recollection of a later production 1914 Erfurt with a matched magazine with one acceptance stamp but did not record the information.

Hi Jan, Sorry no matching Erfurt mag info to contribute, but I believe that Erfurt cut out several other inspection markings about that same time: eg Grip screws, etc. Tom

I have one double stamped mag, date unknown, # 7421a stamps are crown G and crown B

I have a 1916 dated Erfurt P08, sn 400e, that has two matched mags. Both are single stamped in the square end of the plug. Also a 1917, same thing, both mags in the square end.

Thanks
Tom, Herb and George.
Jan

where do i look for the proofmarks and any referances
thanks ken