Not enough information to answer. Please repost with ALL information marked on the rifle, and we will try to help. In general, a muzzle loader marked with a model number is modern manufacture within the past 30 years or so. Originals did not have model numbers.
You can tell how old your Ithaca gun is by the model and serial number
Not enough information to answer,
The model number of the gun and make along with the serial number usually will determine the age of a gun.
Gunsmith, gun show, gun shop, pawn shop, or old catalogs of the maker
21 for hand gun , 18 for long gun
You will need to look in old gun catalogs, Blue Book of Gun Values, etc..
this was my fathers old bird gun lots of stories behind this old model 37 lol
If you are asking about the Benjamin Air gun model 342? It was made between 1969-1992
Series H
your gun was made in 1936
Try old gun catalogs
The gun was made in 1924.