Internet speak: IIRC= "if I recall correctly"
If you are standing behind the boat looking at the L side of the stern the surface I speak of is on the inside of the stern just below the chainplate (thing the mast cable is hooked to) Get in the boat and open the lazarette (that cockpit seat that opens on the left side) and stick your face down in there and look to the rear; You should see the numbers cast into the hull though i do not know which serial numbers correlate to which model years. If you like you can get me at mrtrimmier at yeahhoo dot cohm.... I have some ads and factory papers a I can send you! :0)
So much for common sense...