David,
Yes you have a real Parker Brothers shotgun and looks to be made in 1874. Your Parker is a very early example made before the advent of the recessed hinge pin. It's hard to determine the grade but it is unique that it has damascus barrels which were usually reserved for higher grades. See if you can provide in focus closeups of as much of the receiver as possible. It should be a 12ga with 30" barrels. It could be a very early example of a Quality D grade but I'll let others chime in when you provide more pictures. P.S. Make the pictures as big as possible, closeup, and in focus
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