Need help identifying an old Parker

[Jake Schultz]

I'm new here, so I apologize if this thread is in the wrong area or redundant. I've been looking into buying this side by side from this old guy. He said it was a Parker so I've been researching to see what it might be worth, but I'm having trouble identifying it.

The serial number is 134123 and I couldn't find anything denoting the frame size. On the water table the only reference to the grade was 'V'. I looked very closely and I'm about 80% sure it was NOT marked 'VH' but just 'V'. Also marked onto the water table was 'ATD March 2, 1878'.

The serial number matched everywhere it was stamped and the gun seemed to be in great condition, although it appeared that nearly all the case coloring was gone. Just looking at it, it looks like a 12 ga, open choke, hammerless, with a double trigger and minor engravings (if that helps any).

Mainly, I was just wondering what price range might this gun be worth, and if it was usable for shooting or just as a collectors piece.

Thank you