I think I see the spiral of the Damascus in both barrels. Did Philadelphia Arms make Damascus barreled guns? At 400% it is kind of like looking at clouds and being able to see indians and dogs and horses but I think I see the hinge pin of a Parker or a Philadelphia Arms gun.
Best,
Mike
Edit: It doesn't look like the forend on the Philadelphia Arms gun on the Fox site though:
http://www.foxcollectors.com/ah_fox/...phia_arms.html