GWYNN ISLAND BOATYARD HIN Decoder
Hull Identification Numbers beginning with GWY were assigned by the US Coast Guard to GWYNN ISLAND BOATYARD of GRIMSTEAD, VA. The company is recorded as out of business since 1981 — 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
GWY
Location
GRIMSTEAD, VA
In business
since 1972
Status
Out of business (1981)
GWYNN ISLAND BOATYARD hulls (1972–1981) predate the current HIN format — expect the legacy straight-year (MMYY) or model-year (M + year + month letter) date codes used 1972–1984.
Free · no account · the HIN is on the transom, upper starboard (right) corner
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GWYNN ISLAND BOATYARD HIN FAQ
What does a GWYNN ISLAND BOATYARD HIN look like?
It starts with the three characters "GWY" — the Manufacturer Identification Code the US Coast Guard assigned to GWYNN ISLAND BOATYARD — followed by a 5-character hull serial and a 4-character date code, 12 characters total. GWYNN ISLAND BOATYARD hulls (1972–1981) predate the current HIN format — expect the legacy straight-year (MMYY) or model-year (M + year + month letter) date codes used 1972–1984.
Is GWYNN ISLAND BOATYARD still in business?
USCG records list GWYNN ISLAND BOATYARD as out of business since 1981. 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 GWYNN ISLAND BOATYARD HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. GWYNN ISLAND BOATYARD hulls (1972–1981) predate the current HIN format — expect the legacy straight-year (MMYY) or model-year (M + year + month letter) date codes used 1972–1984. Enter the full 12-character HIN above and the decoder works it out, including the legacy formats.
Other builders in VA
Sources: USCG Manufacturer Identification Code database (uscgboating.org, refreshed monthly) · HIN format per 33 CFR 181 subpart C. Cite this page: CarWhere, "GWYNN ISLAND BOATYARD HIN Decoder," carwhere.com/hin-decoder/gwy, last verified 2026-06-12.