I've retreived it yesterday, I had asked the gunsmith to perform some refreshing work. It has been my great grandfather shotgun, made in 1953 (gunmaker still unknown).
That was its condition before refreshing (broken hammer spring, rusty and un-blued metal, scratches everywhere, cleared wood with disappearing checkerings):
It's going to join back my nearly century old external hammers "bayard" shotgun and most recent Browning Ultra XS Tool.