Easy, it's a 1969-1972 Gitane Gran Sport. These were entry level models. Everything looks original except maybe the stem shifters. It's in great shape for a ~45 year old bike.
These bikes sold for ~$75 to $90 USD. $10 is a great find!
This bike has a 50cm (19 1/2") size frame made for someone for a short inseam.
Does it fit you? The correct frame size can be calculated by the "standover height" method. You should be able to straddle the bike and have 1" to 2" of clearance between the top tube and your body. Any more, the frame is too small.
If the bike fits, I wouldn't spend too much money upgrading it. New tires and tubes, a major tuneup including new brake and derailleur cables plus housing and new handlebar tape.
This could cast as much as ~$200 at a bike shop. If you take it to a shop and their eyes roll back as they say "FRENCH BIKE"... slowly back out the door and run away!
Find a shop with someone with experience working on old French bikes.
I recommend that you get a modern saddle. Those old plastic saddles were painfully uncomfortable!
Chas.
SF Bay Area, CA USA
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1984 Criterium
1969 TdF
1971 TdF
1974 TdF
1984 TdF x 2 Bikes
1970 SC
1971 SC
1972 SC
1984 SC
1984 Team Pro
1985 Professional
1990s Team Replica