Jani:

I had also deduced 1933 using an invoice in 1926 for 14XXX and guessing Suhler Waffenwerk made an average of 1000 per year. I would say the data stamp would be on the lower tube. In a few of his Merkel articles, Mr. Apel of GGCA( http://www.germanguns.com ) mentions a Mrs. Weiss at Merkel who provides him with the work order info and specifics.

Kind Regards,

Raimey
rse