20-100 usd
SS number 15747
Impossible to value with just the serial number.
25-56 USD
Mod.T 18 22 l.r. F.I.E
No
20-50 or so
50-125
You did not say which model. The Erma-Werke KGP68, which looks like the traditional "Luger" pistol, is about $250-$500, depending on condition. If you have a different model, please repost with that information.
100-1000 USD
10-1000 USD depending on specifics
No more than 50 USD
10-100 usd