The value of a 12 GA choke single shot shotgun made by Keystone Arms Company, especially one that is 70 to 80 years old, can vary based on its condition, originality, and market demand. Generally, such shotguns can range from $150 to $400. Factors like rust, wood condition, and functionality also greatly influence the final appraisal. For a more precise valuation, consulting a firearms expert or appraiser is recommended.
what is a keystone 12 ga shotgunworth
nothing
Most likely a store brand made by Crescent. Minimal value; 50-125 USD
50-100 or so
Keystone Arms Co was a trade name used by E.K. Tryon Jr. & Co, a large catalog hardware store in Philadelphia. The gun would have been made during the early 1900's through WW2, and could have been made by any of a number of manufacturers. That serial number leads one to think H&R.
No sn data available.
1937
Approximate value on this shotgun is $130 - $200 depending on condition.
Tryon was an early gun manufacturer in the Philadelphia area, going back to 1812 or so. Around 1890, they began selling guns made by others under their Keystone brand name, a common practice. Most of their shotguns were made by Savage. Unfortunately, there is no real serial number public database for those store brand guns.
Not sure but I have #9972
Browning company
This Shotgun was manufactured by the Mossberg Company.