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RGF is just standard lugs / lugsets that could be purchased from framebuilders at the time. It stands for "Raccords Garette Frères".
I had many bikes with a RGF BB Shell and they were all sourced in France, which leads me to believe that your frame is simply a Cycles J.C.F. branded frame. A long closed local cycle shop, about 1h south of Paris
i.e. bike shops would get these off a larger distributor and stamp their brand on it.Cycles j.c.f.
15 rue colombier
45480 Outarville
France
Tel : +33 0238395419
I need help to find out who is the producer of this frame. Bicycle is with complete Campagnolo Record / Nuovo record groupset from 70-72`s, Reynolds tubing. Decals are in very bad shape anly letter that is on it you can see on photos. Engraving is near setpost and it have "J.C.L." letter, and on bb shell "RGF". Is there anyone who know who is manufacturer of this frame???