I'm going with mid 70's, but I'm almost certainly wrong. Great project.
Case of beer for your guess Drago. The maillard hubs are marked "40 75". I have a few Maillard hubs and am sure the second number is year of production. That is if the wheels are original. I took a look on the net and it seems I have found a bike with the cheapo gas pipe tubing "Luxtub" while the models "200" and "300" are Reynolds 531.
The posher models are equipped with Hutchinson alloy rims, Maillard LF hubs and Stronglight 49D, the cheaper "100" models with 3 pin spider cottered steel cranks and Rigida steel rims.
It appears I have found a bike with everything 200 and 300 apart from the 531 frame.
I am weighing up how sympathetic (and cheap) a restoration to embark on. Normally I lose control of spending very quickly on my own bikes and the price escalates, mission creep. For the first time in my life I will likely try hard work and patience, citric acid in the ultrasonic bath, light polishing instead of shaping the alu parts with a 2kw 12" buffing wheel type of thing. We shall see which way it goes. One thing in favour of a gentle restoration is that time is not on my side, I have a lot of work at home due to the 40C temps of last month when concrete was supposed to be poured and a short window to Autumn to get a lot done.
One thing, I need a chain and have run out of the Sedis and Regina 3/32" chains I squirrelled away in the 80's, who makes a chain that actually fits the wider teeth of old blocks well?