Originally Posted by
unworthy1
If you confirm the BB threading (specifically which direction are the threads in the non-fixed or NDS or RH cup which is the one shown as partially removed in the pix, AND confirm what the OD of the 3 main tubes are with your digital calipers, then we can at least make a guess as to how likely this is FR or if any of the other countries of origin are still in contention. As Francophile stated the serial number for something of this frame's age may not be so good a clue but if it is then maybe
T-Mar is the best of the best to offer his educated guess.
What is the best way to determine the thread size? For the BB The ID is 33.7mm (1.327in) with OD 40.33mm (1.588in) and looks like it's about 24 threads per inch. Threads clockwise for NDS and I am unable to remove the DS because I don't have a big enough wrench so can't determine right now. There were maybe 4 ball bearings left inside and they measure 0.25in in diameter.
Top Tube OD: 26.25mm (1.103in)
Seat Tube OD: 27.98mm (1.033in)
Down Tube OD: 28.09mm (1.113in)
Let me know if I can do tell you anything else to help!