All:

Thanks for all the effort as after seeing the patent and mainsprings I remember that Emil Eckoldt made drillings on that patent. As Axel notes, Emil Eckoldt hung out his shingle in 1876 within 2 years of Heinrich A. Lindner's founding/expansion. Early on, and possibly prior to H.A. Lindner's sole contract with Schoverling & Daly, Emil Eckoldt was a subcontractor to either Charles Daly or Charles Daly's contact in Suhl. Emil Eckoldt was sourced for the barrel knitting effort and may have performed other tasks. During this period one will see the stamp "E.E.". Sporting weapons from a bit later are found with "E.E.S." and I assume the stamp attribute liability to the same craftsman with "S" being for Suhl. I can't say with certainty when or if the H.A. Lindner & Emil Eckoldt sourcing line was broken, but sometime around WWI a stamp of "EES" encircled by a heart is found. It seems that many of the trademarks of the craftsmen were the same as their telegraph address, and I can't say if it was happenstance or which came 1st, the telegraph address or the acronym found on sporting weapons. The trademark "EcKo" is seen say post WWI and seems to be connected to Hugo Eckoldt as post WWII his examples wear the trademark. I'll venture a guess the Hugo was born within a couple years of the founding of the firm. Emil Eckoldt examples from the 1930s have the "Ecko" stamp.

About this time the Emil Eckoldt firm was making double barrel flare pistols 1st with the Ecko stamp and then their assigned code.

Kind Regards,

Raimey
rse