The green bike is a 1951 250 René Gillet.
Jackymoto says it’s “not powerful, but very comfortable, and handles well. It has good brakes (the front brake is coupled with the back one), and is economical on petrol. The gear box is completely inaccurate and I don’t like to use her in town.”
“On the jolly side : the Bol D’or was once won by a 250 René Gillet (probably not a lot of entries in the 250 category that year!)”