The writing on the fin
This is kind of a random question. I have two identical looking 70cm curtis race fins in my garage. One I know came with a starboad start and the other has a picture of tiki on it so they should have similar origins.
On the top one says "C" and then some numbers, he other "S" and then some numbers. Is there any meaning to the "C" and "S" in terms of hardness and softness or is it just some random serial number. I could imagine "S" is soft. The 64cm drake race fin I got with my f-type says "ST" and then some numbers, maybe standard?
Am I just trying to find meaning in tea leaves or is there a system here?