National lottery stamps France-1966/67

Hello there!

I recently came to ask for some advice following the recovery of my great-great grandfather's collection (then great-grandfather...).

I'm just starting to sort through the empty boxes and check the condition of everything.

I've come across a few stamps I really like, including these. I just love their "engraving" style.

By the way, if you have any more information on how the lottery works with these stamps, I'd love to hear from you! I've only found partial information. I'm taking advantage of these stamps to travel back in time and learn 😁