Salaams all~ I had to look up German Silver which appears to be made of ~ three fifths copper, one fifth nickel and one fifth zinc. Some versions of this alloy may have slightly different ratios of these metals, and some may be made with only copper and nickel, and no zinc. A silver test would deliver the answer.
The work looks new along the edges of the finished worked silver where I can see sharp edges. The incised patterns are uniformally cut and appear new and without wear indicating a freshly worked project. I have to say, however, that the work looks good but I am no expert on these weapons nor do I know the silver smiths of that region. (if indeed it is silver)
Where or if it can be proven that this workshop is producing authentic weapons and provided that there are no illusions by the owner I see no reason why an ongoing ethnographic production unit shouldn't do well...If the work is true then these could be the antiques of the future.
Regards,
Ibrahiim al Balooshi.