For some reason I had in my mind that Carl Gottlieb Hänel concern was in Zella-Mehlis but that is incorrect and it was in Suhl and that would have been the address supplied for the Suhl proof effort. Possibly it was that the firm was associated with Carl Wilhelm Aydt and the target arms, of which many originated in Zella-Mehlis or were proofed there. Anyway many of the Hänel tubes were designed for the Stiegele bullets and some give that the tubes were sourced, which is of course is possible but up till the late 1920s the *H stamp is seen on many Hänel tubes.
Kind Regards
Raimey
rse
