I have the same type of rifle and the only markings on mine are FIREARMS INTERNATIONAL CORPORATION WASHINGTOND.C. 20022, but I haven't seen any type of serial numbers.
What is the caliber, barrel length, finish, grip material, markings on barrel?
If it is not stamped on the barrel or you do not trust the barrel markings, the only reliable way is to have a gunsmith make a casting of the chamber.
Impossible to answer, not enough information. Who made it, what is the caliber/gauge, what is the barrel length, what is the finish, what are all the markings?
Need to know caliber and a detailed description of all markings on frame, slide and barrel.
These are mostly proofing marks and caliber and barrel length markings. There are books on the market that define Belgian proof marks
Can't be determined from the markings you list.
Impossible to answer without a detailed description of all markings, caliber, barrel length, condition, etc..
Need a DETAILED descripton of ALL markings, caliber, stock, sights, caliber, barrel length, etc..
I assume your single action is pre-war ? If so, then made about 1907. As to the caliber, check markings on barrel. that should give the caliber.......
Depends on type of action. Need all of the markings, including the markings on top of the barrel.
Impossible to tell with the information you provided. Have it examined by a gunmsith
They are made in several different calibers. Look on the barrel to read caliber markings.