Ever Seen This Before?? - Surf Side 606

Has anyone ever seen a board like this? Logo says (I think) “Surf Side 606” and has a keel built into the shape of the board. Dims are approx 10’x23"x3.5". Weird thing.

I saw it on Craigslist today and the beast caught my eye. I couldn’t make out what appears to be a name on the logo. Does anyone know anything about these things?

Sixties era wakeboard. Popout. Most likely from '64 to '66. Very similar to another brand called “Inland Surfer”.