Those are Mavic's 2nd gen pedals that they sold with their SSC group around the mid 80's It features both float and release tension adjustment (done with dialed screws at the bottom of the pedals) that most clipless pedals back then still did not have, so it was kinda ahead of it's time. These pedals were most likely still based on Look's clipless pedal design as their first gen clipless pedals were, so Look Delta type cleats should work with these pedals. Any shoe with the Look three bolt cleat mounting system should also work with these pedals.
These used to go for relatively cheap even as NOS (sometimes just around 70 to 80 bucks), as they are kinda clunky looking and on the heavy side, compared to most other clipless pedals, but have since, in the last couple of years, rose up in value in the auction sites with NOS examples now easily breaking the $120 price point.
Some people called this pedal the "Lego" pedal because of the bright yellow plastic parts in distinctive geometric shapes it had that catches the eye.
Very nice classic clipless pedals, specially if you are putting together a mid 80'd Mavic SSC group for a bike.

Chombi