1850-1870
50-100 or so
Under $200.
Pieper was a Belgian gun maker, so it was most likely made in Belgium. Look for the Belgian black powder proof marks.
Unknown
Eclipse Gun Company is a name found on Belgian manufactured double barrels from around 1900-1916. The manufacturer was Henri Pieper. Please note that the Damascus barrels were meant for BLACK POWDER shotshells, and should not be fired with modern day ammo.
No
Parker 12 ga muzzleloader
You don't.
Dozens of comapanies.
WILMONT GUN CO guns were made in Belgium from c.1880 to c.1915. Value is going to be low, with excellent examples under $400. Please do not attempt to fire the shotgun.
With the serial number that you provided,your Ithaca double barrel shotgun with the damascus barrels was produced in the year 1900.
A Damascus twist steel double barrel shotgun is an antique shotgun made by layering iron and steel and welding them together. This kind of shotgun is worth approximately $3,000 depending on the condition of the weapon.