Re: 30 Luger value
One picture that would help greatly would be the top of the receiver. There would be the maker's mark and, probably, the year made. Proof marks are from between 1912 and 1939. The U under the crown is "Inspected". The N under the crown is "Nitro" (smokeless powder) The "Germany", in English, means it was made for export to an English speaking country, not for sale in Germany itself.
Meddle not in the affairs of dragons, for thou art crunchy, and taste good with catsup - George of Lod, Year of Our Lord 297
I always take precautions.
Beware the Evil Bullet Fairies.