My Gitane TdF has a serial number on the left side dropout.
Gitanes can be frustrating, to be sure, but are a very nice ride.
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1971 Paramount P-13 Chrome
1973 Paramount P-15 Opaque Blue
1974 Raleigh Professional Blue Mink
1991 Waterford Paramount
Holland Titanium Dura Ace Group
Holland Titanium Ultegra Triple Group