Hi there, here are a few points on German silver marks.First of all the Half moon and Crown mark are nothing to do with Otto Gahr.
They are German Reichs marks.Half Moon and Crown for silver and Sun and Crown for gold.
The item is made first,them the metal is tested for its silver content,and the hallmark is then struck.
On small objects the Reich mark is not used ,just the number.
Heres is a link to German Hallmarks.
http://www.925-1000.com/Fgerman_marks_a1884.html

Hers a gold item by Gahr,From Snyder's Treasures.? I 'am still trying to find a silver one. I hope this helps with some of your questions,nats

EBGahr585PinR.jpg (49.57 KB, 287 downloads)
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