Mike,
You're thinking of Teft - it may have been George Teft. He did most of his work for Kimball Arms who actually sold the stuff.
The late William G. Renwick, just starting out in collecting in the 30s, was one of the big losers. When he learned how he'd been taken he simply gave up on collecting American guns altogether and turned to European arms which were so elaborate that faking them wasn't terribly viable at the time. (He was wrong there, but he still had some wonderful things, including the Louis XIV fowler thats in the Met.)
Mike Brooks is spot on. Its a perfectly good NE fowler made from an assortment of parts, some of which came from a 1728 or 1742 French musket. As to the name, when in doubt always check the first or second editions of Gardner (1934 & 1936) This is where the names came from because it was about all there was at the time...
What a surprise! Seth Johnson is listed as a Committee of Safety gunsmith from Rutland, Mass. The name on the lock looks bad and, if he really assembled the gun, he would have been very unlikely to have put his name on the lockplate (which was hardened). Few early NE guns are signed, especially assembled ones, and when they are it is almost always on the barrel (which was soft)...there are some exceptions but this isn't one of them. This was probably sold to some unsuspecting person as a "Revolutionary War Committee of Safety Rifle". They may have gotten $75 for it when, in untampered with condition, it was worth $20.
Also, it may not be a Teft fake. Teft usually engraved his locks in a fairly large flowing hand. That signature almost looks stamped (which would be impossible). Its too irregular to be believed. Besides, as I said, NE gunamkers usually signed the barrels and they aren't engraved at all, they are usually etched which is why the signatures look like their real signatures...they are.