Yes, Skats swirl design came out after the Mariner reactor in the early 90's.
Sorry for any confusion, I belive we talking about the Skat Freeride impeller for the Yamaha 144 mm pump. Albeit, various swirl designs have been around for a lot longer than the Concord, the Skat "free ride" swirl for the Yami's came out a few months after the Concord. The FR is a not a marketing term, but is a differnt design than their previous swirls. The FR is an awesome prop. A much better design than the previous ones produced for the yami 144.
hope this helps,
G