Sounds like you had a good time, even on the old gear.
www.seabreeze.com.au/forums/Windsurfing/General/Mistral-board-identification-please/Sounds like a mistral Taloa. If it weighed 25kg it may have taken on a bit of water

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They first came out in about 1987.
AS an aside, it was a substantial departure from the norm back in the day, a board over 3m length with no centreboard.
At that time all the major imported manufacturers had 6-8 boards in their range, and all except 2 had centreboards- the reverse of what we see nowadays.
Clarence