Hopkins & Allen/ Merwin Hulbert?

I have a single shot rolling block in excellent condition bore is very clean and actions tight, gun is almost immaculate, stamped pat'd June 23 1885, serial number 8XX and has 44 W.C.F stamped behind the sites, picked gun up next to nothing and cant find anything online about this particular one or even how much its worth? if anyone has any info that would be great