Thanks for the update. I just found out my 5.0 is a 1990 model, word came direct from Mystere. I have requested any factory information on the 1990 model 5.0 - if I get anything, I will pass it on.
I have some work ahead of me to get her restored, and I think it will be worth it! Short list of work ahead... Sand and paint the hulls. Strip and remove the paint form the mast, cross bars, and spinaker pole. Replace the trampoline, replace the sails main and jib. Both are in very rough shape...
1990 - Mystere 5.0
1974 - Terrapin 24 (Family Cruiser)