|Thanks Chris, the good news is that you love the boat. How clear is the HIN on your transom? If showing its 40 years of life you should open a bottle of (red) wine, burn the cork a bit and rub the blackened end over the HIN. Now clean the surface area around the number with a blackboard eraser and you have that HIN in clear, black letters. Any change to the one you reported?
In addition to your upper shrouds, do you have single lower shrouds,, or two each side? As you will have read, that change is a split between Mk 1 and Mk11.
The 167 or 215 number puzzle is just that.....
Good luck....... now drink the wine.
Alan of SMOKE 1984 Mk V 002