I have a partial answer and plan to submit a question. Ithaca hammer shotguns with serial #'s below 33011 were produced before 1899. I have a hammer double barrel stagecoach shotgun with serial # 15864. I will post a question to find out its age.
100 USD or so.
its the manufacture.
We must know the manufacturer, model, exposed hammers or not, and the condition of the gun...The rest is easy...The manufacturer and model will be stamped or engraved on the metal somewhere What is the manfacturer, model and condition of the gun...the rest is easy...
If you take it apart, it is possible that there may be manufacturer marks, but the number stamped is no indication of the manufacture. If it has any unique features, such as the early lever operated ball return, it can help to identify it.
nitro hunter shotgun single barrel with exposed hammer stamped belknap hdwre and mfg serial 5516
The test pressure is always stamped on the cylinder along with the working pressure, physical volume, manufacture date etc. It is generally about twice the working pressure of the cylinder.
It's date stamped, check the manufacture date page on the Remington Society of America for details.
1959.
in my opinion, it is legal.
This is an uncommon error and one example was estimated to be worth excess of $20,000.
Year of Manufacture is stamped behind the serial # on the left side of the receiver.
1932, date code stamped see related links