Didn't say it was a Falling Block. I said your shotgun ( side lever in which the rear of the trigger guard curls up to act as a barrel break lever ) was made by both Hopkins and Allen and Iver Johnson. Which company made yours, don't have the foggiest with out pictures.
How ever , pull the front wood, if there are no proof marks then it is US made by one of the aforementioned two. The US did not have a national proof house. Also if it has patent dates or patent pending then it's an Iver Johnson. As I stated before, either Hopkins and Allen made theirs prior to Iver Johnson patent, or infringed on the patent.