The Goulcher's were an English "Black Country" lock making family, one of whom emigrated to the United States. He apparently claimed to be making locks in the US at one point (though, personally, I doubt this). The emigrant Goulcher may well have been the Birmingham lock maker that John Dent Goodman met in Philadelphia and mentioned in his testimony to Parliament in the 1850s. Most likely he imported them from other members of his family or was acting as their agent. There was no "truth in advertising" law in the 19th century so claims that they were "made in America" have to be taken with a large grain of salt. Its quite possible that the name was copied on even less expensive Belgian locks. In fact, I think I've seen photos of "Goulcher" marked locks that are unfinished and still in Belgium. At one time I had an unused example that had never been drilled for the lock screws or recessed for a drum. These were likely made to order in large quantity for some American wholesale hardware dealer but baring the appearance of some new cache of 19th century business records (themselves extremely rare) I doubt we will ever know the full story.