It is the forerunner of the Shiloh 's made today .
Wolfegang Droege was the maker and in the early 1980's I believe he moved to big timber Mt. and built them there with a fello names John Schofstall . Shoftstall has the trademark on the "Old reliable " roll mark
today and runs the montana armormy and builds a 74 pattern rifle still .
the company that Droege had, sold to the Bryan family in the late 80 or early 90s and they are operating the store now and are the owners of the Shiloh name and theirs is the Shiloh Sharps rollmarked on the barrel
the gun you have is made probably in the 70's sometime and the calibre marking you list doesnt sound right if it is 45-110 it should be 45 2 & 7/8 and if it is 45 3 & 1/4 it should be a 45-120 both rounds are handload only and require a lot of patience to load but are extremely accurate although heavy recoiling.
www.shilohrifles.com is theur home page and if you want to find out a lot about these rifles check out their forum it is packed with all the info you need and a lot more..............Dean