[Channing Greene, Sr]

I have a Parker 12ga double barrel, 26" barrels. When I had it evaluated recently, I was told that the barrels were not the originals. The serial numbers differ and the current barrels are Special Steel and Vulcan. The serial number of the actions begins with 984..; There is also a stamped "May 7-Oct 9.1889".
I need to clarify whether the barrel change, if there was one, was done by Parker, or whether Parker produced shotguns in this serial # range with other-than-Parker barrels.