That is sufficient and confirms that um it passed thru the Zella-Mehlis proof facility. With a serial number like 19207, it would have been sourced from a larger Zella-Mehlis concern who in turn subed the tube work to Louis Kelber, one of the top tube makers on par with one of Belgium's best, Jean Falla. The tube makers were a very proud group and rightfully so as their work was the basis for the sporting arm. If the tubes burst on the 1st test, the tube maker had to replace at his expense. If the tubeset burst on the 2nd test then the tube makers & tubeset knitter accepted the blame. Then if the longarm submitted in the final state fails the proof test, then the whole lot of mechanics had to accept the failure and that along with compensation is the reason for the maker's touchmarks.
Kind Regards,
Raimey
rse
