Vintage 103 racer seat.
For Peugeot? Not sure how it mounts though. Put it on whatever you want if you're clever enough.
Roughly 21" long by 8" wide. The hump is 7" tall.
This is a vintage, new old stock seat but it has wear from years of storage. There is a small tear on one side and it could use a bath.
This is the last one. Sold AS-IS. No returns!!