You know after I bought it we spent hours trying to figure it out and finally gave up, just too many probabilities. Just a few we came up with; Boston (was first), Bridgeport, Baltimore, Bristol, Birmingham, Bangor, Buffalo, Beaumont, Bayonne ect ect ect. There are actually so many just in the US it boggles the mind. Just for background I bought it at the Numrich store that use to be in West Hurley, NY which means nothing as it could have come from anywhere in the world.
It was a candyland for milsurp lovers. Not to mention the dozens of civilian firearms I left there with all at amazing prices for the day and nearly free by today's standards. Also if you were there on a good day Auto Ordnance which was across the street would be testing the full auto Thompsons. That always brought a smile on top of the haul we walked out with.