Hull Identification Number
Boats made after November 1, 1972 are required to have a hull identification number (HIN). The HIN gives information on the manufacturer, month and year of manufacture, and a unique hull serial number. The HIN is regulated by the US Coast Guard and should not be confused with state watercraft registration numbers which are assigned by state agencies.
For more information on locating and deciphering HINs, see the following article and links:
Hull Identification Number Explanation