Russell Arms was used by several makers in the 1890-1915 time period. If yours is a "top break" gun, remove the forearm, then open and remove the barrels, and check the frame under where the barrels close. However, you may not find a serial number.
They were not required by US law on rifles and shotguns until 1968. Perfectly legal to own a pre-1968 gun that never had a serial number. Highly illegal to REMOVE a serial number.
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