Question regarding Parker Shotgun?

[Gary Welch]

I was wondering is someone could provide a little information on this Parker, possible value. It is a Parker 20g, Ser #68063, Dates March 16, 1875, engraving on both side and botton plate of I believe pheasants and one site ducks. Serial number match on base plate and stock plate, stock plate marked 2, 68063, G, Pat. Jan 18th - Aug 16 1887, May 7-Oct.8 1889. Barrels seem to have been replaced with ESC-Vickers Works, Nickle Steel maked with Finito, P-105, 20g 2-3/4. Gun is in great shape wood excellent with most engraving still very good shape, blueing is good on barrels and bores are in great shape. Functions flawlessly shot 4 rounds of skeet for test and broke over 20 every round.