This is a WaterWay Model-2 Monofin. I believe the size is 26cm. There is a marking on the heel. I usually wear 26.5cm in NIKE shoes, but this fin felt a bit tight when worn barefoot. There are scratches overall, but I think it's in relatively good condition as a fin. Please check the images carefully. I will wrap it in bubble wrap, put it in the original case shown in the pictures, and ship it with clothing for protection.