Maybe this will help. Found it in the forum. HINs By The Numbers
A typical hull identification number (HIN) consists of 12 letters and numbers, as in ABC12345D404.
12345: This is the serial number assigned to the hull by the manufacturer. This may be a combination of letters and numbers. The letters "I," "O," and "Q" are excluded because they could be mistaken for numbers.
D: This is the month of certification, indicating the month in which construction began. "A" represents January and "L" represents December. In our example, "D" means April.
4: This is the year of certification. The number is the last digit of the year in which the boat was built. "4" in this case designates 2004.
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