I have an old single shot 12 ga. modified choke shotgun that I believe my grandfather bought new. It was originally purchased around 1900 and designed to shoot black powder cartridges. I would like to find out more of its history, but there are no markings on the gun. It is a typical takedown model with the fore stock removed, allowing the barrel to be removed from the stock. Each of the three pieces is stamped with the number "74". No other markings. Does anyone have any ideas?