GRAVES YACHT YARDS INC HIN Decoder — MIC GYY
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.
How a GRAVES YACHT YARDS INC HIN breaks down
A current-format (1984–present) Hull Identification Number is 12 characters. Using the example GYY45678D424 (illustrative):
| Characters | Segment | In example | What it identifies |
|---|---|---|---|
| 1–3 | Manufacturer (MIC) | GYY | Identifies GRAVES YACHT YARDS INC, assigned by the US Coast Guard. |
| 4–8 | Hull serial number | 45678 | GRAVES YACHT YARDS INC's own production number for the specific hull (the letters I, O, Q are never used). |
| 9 | Certification month | D | Month built — A=January … L=December (D = April). |
| 10 | Certification year | 4 | Last digit of the certification year. |
| 11–12 | Model year | 24 | The boat’s model year. |
Free · no account · the HIN is on the transom, upper starboard (right) corner
Buying this GRAVES YACHT YARDS INC? Check it before you pay.
GRAVES YACHT YARDS INC is recorded out of business (1999) — which affects recalls, parts support, and resale. The $9.99 Boat Report adds the full CPSC marine-recall check, a HIN consistency check, a verify-before-you-buy checklist, and the USCG builder record for this hull — one downloadable report, one-time, no subscription. See what's included
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.
Where is the HIN on a GRAVES YACHT YARDS INC boat?
On the outside upper-starboard (right) corner of the transom, within two inches of the top — required by 33 CFR 181.29. Since August 1984 an identical duplicate HIN is also molded into an unexposed interior location as an anti-theft measure. Both should match the title, registration, and insurance card exactly.
Is the "GYY" MIC the same as a GRAVES YACHT YARDS INC serial number?
No. "GYY" is the Manufacturer Identification Code — characters 1–3 of the HIN — that identifies GRAVES YACHT YARDS INC. The hull serial number is characters 4–8: GRAVES YACHT YARDS INC's own production number for that specific boat (the letters I, O, and Q are never used). The full 12-character HIN combines the MIC, the serial, and the date code.
Can a GRAVES YACHT YARDS INC HIN tell me the exact model?
Not on its own. A HIN encodes the builder, hull serial, certification month/year, and model year — not the model name or length. Match the decoded year and serial against GRAVES YACHT YARDS INC records, the title, or a marine survey to confirm the exact model and configuration.
Other builders in MA
Sources: verified against the USCG Manufacturer Identification Code database (refreshed monthly) · HIN format per 33 CFR Part 181, Subpart C. Reviewed by Sam Reynolds, Lead Researcher, CarWhere. Cite this page: CarWhere, "GRAVES YACHT YARDS INC HIN Decoder," carwhere.com/hin-decoder/gyy, last verified 2026-06-15.