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Thanks for the info. I’ll check it outI posted this answer about the fins in the wrong thread.
The Mark IX fins were around in the 70's. I do not know exact years.
The first catalog (AMF Voit Swimaster) that shows the Mark IX fins is in 1971. They were still shown in the 1979 catalog. That is the last catalog copy I have.
You can download copies of all these catalogs from VDH.