First one is from the Original Windsurfer, with the tie-on neck piece at the booms. It seems to be a US model, not the Oz one, so would have to be real early before the Aus model. So no later than 1981-2 or so. And no earlier than 1980 - teak before !
I was using one of those boards just yesterday - there was little wind and I still wanted to get out...
