Try the library and old gun catalogs.
could be the serial number or an assembly number.
If you have a project on Belgium, you could bring clothing from Belgium as one of your 3D objects. You might also bring a food item that is native to Belgium.
We will need to know the model as the serial number could be the same for more than one model.
The Hitler Pages has many pictures of Hitler with his staff and others on their website. There are many noted and dated pictures of Hitler in France, Belgium and Germany which one could view. History books are also a great source for pictures on the war and Hitler.
Depending on the Firearms condition, price could go from about $100.00 to around $300.00
There could be a variety of 20ga shotguns that could be valued that high. Superposed High grade guns could get that high as well as possible custom engraved one of a kind A5's.
500 USD give or take
Your browning model superposed could bring between 550-1,500 dollars depending on overall condition,and a good bore.
Yes, you could be blasted to PIECES with a shotgun
Depends on condition and what grade. Could be a few hundred or multiple thousands. No way to tell without a better description.
Not without knowing if it is a pump, semi-auto, over under or side by side. List all the markings on the weapon also.
The circled ELG is a proofmark indicating manufacture in Belgium. If there is a crown above this mark, it would indicate proof testing after 1893, and if not it would have been earlier. Could the UMG be UMC instead? That could stand for Union Machine Company, a trade name used by Henri Pieper, Herstal, Belgium, 1877-1898.