16 gauge, choke, with a serial number A495xxx. Keystone Arms Co. Philadelphia, PA is inscribed on the left side. It is single barrel, single shot, with an external hammer.
Might have been made by someone else and marketed by Keystone. Alternatively, it might have been a local company. Value is sentimental or as a shooter. As a very general rule, even in really great condition, they don't bring much above $100. Ususal disclaimers apply. Any other markings on it?
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