Did find this which might be interesting to you:
"The Vainquer bicycles were made in Luxemburg and imported by S/M Multicorp Inc. of Albuquerque, New Mexico. They had a relatively limited distribution and therefore are rare, though not valuable. You appear to have found one of the better models, judging by the rims and seatpost, which by itself, is valuable. It appears to be a step or two up from a UO8. Does the dropout include a derailleur hanger, or does the derailleur use a claw adapter? What is the internal diameter of the seat tube? Other components?"
"RE:RE:VINTAGE LIGHTWEIGHTS: Triumph bike & Vainqueur bike posted by Joe on 2/23/2004 at 6:15:00 AM
The Vainqueur has a claw type derailleur hanger adapter, and 27" rims. The rims are similar to those used on some Schwinn bikes but with regular Normandy hubs. Hubs are nutted axle, and shifters are frame mounted with a clamp and no braze-ons. I'll have to measure the seat post.
The habdlebars and stem are alloy, the stem is strange looking, at least compared to say an AVA or Pivo stem. It has the imitation lug pattern on it like an AVA but has a crude looking bar clamp area. Weinmann centerpulls and levers.
The bike registration decal is dated 1972, but it appears to have several prior decals beneath it.
Any idea as far as when these were made? I am guessing by equipment and the reg. decals, this must be late sixties?"
"RE:VINTAGE LIGHTWEIGHTS: Triumph bike & Vainqueur bike posted by T-Mar on 2/23/2004 at 7:29:34 PM
I have references showing Vainqueur made it through the early 1970's bicycle boom, past your 1972 label. Given the aluminum rims, I'm a little surprised with the nutted axles, however the aluminum rims and handlebar, and the Simplex seatpost are nice touches that make this stand out from your garden variety Peugoeot U08, Gitane Gran Sport, Mercier Model 100 and the various clones. Given that the Prestige was introduced in 1961 and that you have a 1972 registration label (with several underneath it), it would seem to be a pretty safe bet that it is a 60's model. I would probably try to carefully peel off the registration labels. The oldest label is probably the year the bicycle was bought."
You might have some valuable bits and bobs on your hands! Bon chance...