GRAVES YACHT YARDS INC HIN Decoder
Hull Identification Numbers beginning with GYY were assigned by the US Coast Guard to GRAVES YACHT YARDS INC of MARBLEHEAD, MA. The company is recorded as out of business since 1999 — 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
GYY
Location
MARBLEHEAD, MA
In business
since 1981
Status
Out of business (1999)
GRAVES YACHT YARDS INC built hulls across both HIN eras (1981–1999): boats before August 1984 carry legacy straight-year or model-year date codes; later hulls use the current month-letter format. The decoder handles all three.
Free · no account · the HIN is on the transom, upper starboard (right) corner
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GRAVES YACHT YARDS INC HIN FAQ
What does a GRAVES YACHT YARDS INC HIN look like?
It starts with the three characters "GYY" — the Manufacturer Identification Code the US Coast Guard assigned to GRAVES YACHT YARDS INC — followed by a 5-character hull serial and a 4-character date code, 12 characters total. GRAVES YACHT YARDS INC built hulls across both HIN eras (1981–1999): boats before August 1984 carry legacy straight-year or model-year date codes; later hulls use the current month-letter format. The decoder handles all three.
Is GRAVES YACHT YARDS INC still in business?
USCG records list GRAVES YACHT YARDS INC as out of business since 1999. 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 GRAVES YACHT YARDS INC HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. GRAVES YACHT YARDS INC built hulls across both HIN eras (1981–1999): boats before August 1984 carry legacy straight-year or model-year date codes; later hulls use the current month-letter format. The decoder handles all three. Enter the full 12-character HIN above and the decoder works it out, including the legacy formats.
Other builders in MA
Sources: USCG Manufacturer Identification Code database (uscgboating.org, refreshed monthly) · HIN format per 33 CFR 181 subpart C. Cite this page: CarWhere, "GRAVES YACHT YARDS INC HIN Decoder," carwhere.com/hin-decoder/gyy, last verified 2026-06-12.