Geno:
I agree that the tube craftsmen worked at Sauer. But easily one of the aforementioned fellas could have worked at Sauer depending on the magnitude of orders at the time. Sauer made mainly Krupp tubes and I am curious if any other type steel tubes bear the stamp of the caveman with a club? It is possible that only the bigger concerns kept a serial number ledger and it wasn't until October of 1928 when a new gun law forced all makers to keep a serial number ledger, which I think could be inspected. Production of military weapons during WWI really established the connections for sourcing.
The stamps of the caveman with a club on the flats just may indicate assembly at the Sauer plant. I see what looks to be a "M" on the inside of the left tube, of course the script "MM" on the lower rib and what looks to be a "KW" on the right tube. I don't think "M" was for mechanic but was the initial of the craftsman at Sauer, possible in an apprentice/journeyman program?
Kind Regards,
Raimey
rse
