I can’t find any information about Chapuis shotguns?

Chapuis shotguns: I have recently acquired a Chapuis shotgun, an over-under 12-bore with sideplates. However, I am experiencing difficulty finding any information about the model, the year of manufacture and the value of this gun. The only mark is a serial number 10055.

Is it safe to use steel shot in my 10-bore shotguns?

Is it safe to use steel shot in my 10-bore shotguns?

Steel shot: I have two 10-bores. One is a Gunmark Kestrel with 3.5in chambers rated at 1,200kg/cm2. The right bore is machined to 0.751in and the left bore 0.729in. The second gun is a Zabala LP71, which also has 3.5in chambers rated at 1,000kg/cm2.