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next to the barrel
Central Arms shotguns were made by several manufacturers, but that patent date says J Stevens Arms and Tool Co.
If no serial numbers are present,than you can be sure that it was made prior to 1969.Other than that I cannot say.
On the but
what is the manufactureing date a hero arms company for 12 guage shotgun serial number 781
1896.
No published sn data for this shotgun.
50-100 USD
40-110 yrs
About $100.
Try e-gunparts.com
50-100 USD