Hull Ids are not necessarily assigned by model especially if there are many models being built in the same factory simultaneously like Sea Ray does. Unlike cars there is no way to decode a model from a HIN.
Hmmm....
I knew the date codes (month/year and model year), but I've not before come across HINs before where characters 4 and 5 (Y1, for discussion here) weren't a fixed model designator.
-Chris