I have a Greener shotgun that I have been unable to get much info on, It is a side lever 10ga serial number 13191. I have been told that it was built before 1875 but have been unable to come up with a exact year. Any help would be greatly appreciated. Would also like to see if there is anyone out there shooting Bismuth shot and black powder, so far I have had real good luck with this shotgun and Bismuth.