There were just a few klans of weapons craftsmen with the last initial J: Jaeger, Jopp, Jlich, Jung & Just. I don't recall exactly what weapons making task A. & J. Jlich were centered around, but the rest knew tubes. I don't know the descendants of August Jopp but he hung out his shingle in 1850 and during this time the gunmaking community was a very tight-knit community with sourcing lines along those of marriage. Friedrich Jung too was founded in the 19th century & had heirs & assigns like Oskar & Hugo. Richard Jung was also in the mix and held a stake in Greifeldt, and they offered a similar model. From the get-go, Friedrich Greifeldt, Emil Schlegelmilch, Alfred Greifeldt, Oskar Jung along with Richard Jung were at the helm at some point at Greifeldt & Company from 1885 to WWII. Wilhelm Richard Jaeger was a tube maker and for now I attach a high probability of a "J" found on a tube to be associated with Jaeger. E. Just was also a tube maker in the 1930s.
Kind Regards,
Raimey
rse
