I appears that the Texel rating listed Shark is about the same boat. Only texel lists a shorter mast and less overall sailarea.

On these texel specs the shark get the following NMBR numbers

light 101
heavy 99

If we have to guess at it a number around 99 seems to be right. Only this design is pretty old and arguable less efficient. I'm not to sure wether the NMBR rating gives a very accurate prediction here. Afterall NMBR estimates potential for a given box of specs. It is up to the skills of the designer to bring out that potential in real life. ONE-Design classes of 40 years are arguably at a disadvantage here. They can grow with the new developments.

But I anxious to hear how these numbers come out of your tests

Wouter