What is the age and value of a 12 gauge single barrel shotgun marked Keystone Arms Co Philadelphia serial A489108?

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.

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