It should not differ after 1972
Manufacturers of recreational boats have been required to assign a unique, 12 letter/number combination HIN since November 1972. The standard formats used since 1972 are shown in the chart on page 3. The first 3 letters of the HIN designate the Manufacturers ID Code (MIC) assigned by the Coast Guard. This may be used as an aid to determining the manufacturer of the boat if it is not known. Boats manufactured prior to 1972, homemade boats, and boats built specifically for commercial fishing may not have a HIN. Boats without a HIN will have a HIN assigned by DMV when they are initially registered.HULL IDENTIFICATION FORMATSThe NEW FORMAT replaced the STRAIGHT YEAR and MODEL YEAR formats. Although optional as of January 1, 1984, both the NEW FORMAT and the confidential HIN’s were required as of August 1, 1984.NEW FORMAT (August 1, 1994)BMA 45678 H4 85 Manufactures ID Code (MIC) Production or Serial Number *Month & Year of Production Model Year *Key to month of production for New Format. In the example above, H4 would be August 1984. A - January D - April G - July J - October B - February E - May H - August K - November C - March F - June I - September L - December STRAIGHT YEAR (November 1, 1972) ABC 12345 08 83 Manufactures ID Code (MIC) Production or Serial Number Month of Production Model Year MODEL YEAR (November 1, 1972) XYZ 45678 M 84 A M Designates Model Year Format Model Year *Month of Production *Key to month of production for Model Year Format. In the example, month is August. A - August D - November G - February J - May B - September E - December H - March K - June C - October F - January I - April L - July