NEPTUNE SAILS HIN Decoder
Hull Identification Numbers beginning with NPN were assigned by the US Coast Guard to NEPTUNE SAILS of STERLING HTS, MI. The company is recorded as out of business since 2001 — common for older hulls, and useful to know when hunting parts or records. Enter the full 12-character HIN below for build date, model year, and serial — free, no account.
MIC
NPN
Location
STERLING HTS, MI
In business
since 1985
Status
Out of business (2001)
NEPTUNE SAILS hulls (1985–2001) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
Free · no account · the HIN is on the transom, upper starboard (right) corner
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NEPTUNE SAILS HIN FAQ
What does a NEPTUNE SAILS HIN look like?
It starts with the three characters "NPN" — the Manufacturer Identification Code the US Coast Guard assigned to NEPTUNE SAILS — followed by a 5-character hull serial and a 4-character date code, 12 characters total. NEPTUNE SAILS hulls (1985–2001) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
Is NEPTUNE SAILS still in business?
USCG records list NEPTUNE SAILS as out of business since 2001. That's common for older hulls — the HIN still decodes normally, and the out-of-business date helps date the boat and guides parts-hunting toward salvage and owner groups rather than a dealer network.
How do I decode the year on a NEPTUNE SAILS HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. NEPTUNE SAILS hulls (1985–2001) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits. Enter the full 12-character HIN above and the decoder works it out, including the legacy formats.
Other builders in MI
Sources: USCG Manufacturer Identification Code database (uscgboating.org, refreshed monthly) · HIN format per 33 CFR 181 subpart C. Cite this page: CarWhere, "NEPTUNE SAILS HIN Decoder," carwhere.com/hin-decoder/npn, last verified 2026-06-12.