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kato said..
It was called a speed watch and had a little propeller that you attached to your fin. The watch velcroed to the tail of the board. Daffy had one
I've still got one as well and it's still working ??
Also had an attachment to measure the wind as well as the tow behind propeller
Solar powered made in Switzerland way ahead in there day.
used it on my bic allegro .
Will take a pic soon.