Originally Posted by repechage

1978 is a good enough guess.
Bertin models were subject to change by order-
the parts are pretty basic with a notch better tubing.
should ride pretty well.
I cannot tell but hopefully the wheels are 700c.

I would give it a full service.
at the minimum rear cables to front and new rear cables.
consider fresh brake pads, Kool stop replacements salmon are good.

the headset and bottom bracket will have loose ball bearings. Take care to remove the cotters - they are French and no longer a trip to the local bike shop to replace.

remove the tires, true the wheels, oiling the spokes first with penetrant. Check the rim strips. Probably Velox and old enough to vote.