Originally Posted by Northern Pike
I had a 1980s Mark 2C, and it didn't have a board like that.
There a lot of them with varying features. Futura, Virage, Tour.S, Touring, GT... Not to mention, there were about 5-6 model revisions thanks to increases in technology between 1980-1990.
With that being said, thrustboards are pretty obsolete technology...they do hold up better though in rough seas though. There's less of a chance of a floor panel being knocked free.
But then again, who has actually taken their SIB on 2 to 3 meter swells before?