Not without a detailed description of all markings, finish, barrel length, chokes, accessories, papers, etc..
Belgium and Japan
What is the question?
@ 44 years old
50-500 usd
50-350 USD or so
What specifically is your question???
very high
100-2000 usd
Depending EXACTLY on what you have 100-multiple thousands.
Best left to a trained gunsmith.
Impossible to answer without a detailed description.
A shotgun made in Belgium