Joined: Feb 2012
Posts: 19,353
Likes: 5,471
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Back in 1978 BCM lugs were in the US for fame builders. IIRC Cycle Imports (of Cornish MI) offered them along with Prugnat too. So, the presence of BCM lugs won't eliminate USA builders. What does, IMO, eliminate USA builders is the low grade of the joining prep. Pretty much any USA builder who would have used lugs back then would be a small job shop at the largest to a one man show at the smallest. I seriously doubt any of these shops would not do a better job of the tube miters.
I think one will find that many brands had BCM lugs.
French shells were also available here but rarely used. I have no specific memory of any USA built frames with French BBs but I'm sure there's a few out there. Very few. Andy
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AndrewRStewart