We sold one of Fitz’sy boards in my Hawaiian Islands Vintage Surf Auction in 2007.
It was from the collection he had in Hawaii.
But the one that became a windsurfer was clear, so I don’t think it was one out of his quiver shot boards, as they all had color and the biggest one, had a pale blue hue to it.
If it was me, I’d pull the fin box and all the foot strap plugs out and restore it to the condition it was meant to be. Not one it devolved too!