Until recently I thought footpockets and interchangeable blades design was less than 20 years old. I got my first pair of Sporasub H Dessault footpockets about 10 years ago. Recently one of the forum members came by with these Beuchat fins. He said the fins are 30 years old. I was amazed to see it's the same system we have today. The plastic blades had a lip on the edges that the footpocket tendons held on to. The footpockets weren't very soft but they looked well made. The blades were not as long as our long fins today but they were definitely longer than any scuba or snorkling fins that I've seen. I guess I should have measured them. Looks like Beuchat may have been the first to manufacture footpockets for replaceable blades.
