[quote=DamonLinkous]The decoding of HIN numbers changed in 1984, it was still the last three digits but before 1984 it was a two digit year followed by a letter to indicate the manufacture date like 78A would be a a 78 model built in August of 1977.
Using the post-1984 method that same boat would have 778 as it's last three digits meaning a 1878 model built in 1977.
Model years general started in August, which is why A represented August it's not an abbreviation.
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