Current production Vitos split up into two categories: Stencilled Yamaha 23 series horns, including the bari, and Taiwanese horns, from which factory I don't know. If the horn says Leblanc, I'd bet it was made for a foreign market and is in fact Yamaha product. The Yamaha Vitos come from Yamaha in pieces and are assembled by Leblanc in Kenosha, while the Taiwanese ones come assembled. If you go to Leblanc's website, you'll see that there's one other Vito alto listed, and the site says it's made in the USA. Well, I don't think they ever sold any of these, but they were honestly pretty close to bringing back an American-made Vito. There are bits and pieces of them all over Kenosha.
I've personally seen two Yani-made Vito baris, and Two French Vito baris, one of which said Noblet above or below the Vito logo. The other one was pretty weird--double articulated low C key, in other words two keys over two tone holes, operated by one touchpiece--and both of the French baris tuned very badly.