AMERICAN GENERAL MARINE HIN Decoder
Hull Identification Numbers beginning with AGO were assigned by the US Coast Guard to AMERICAN GENERAL MARINE of MARYSVILLE, WA. The company is recorded as out of business since 1984 — 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
AGO
Location
MARYSVILLE, WA
In business
since 1983
Status
Out of business (1984)
AMERICAN GENERAL MARINE hulls (1983–1984) 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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AMERICAN GENERAL MARINE HIN FAQ
What does a AMERICAN GENERAL MARINE HIN look like?
It starts with the three characters "AGO" — the Manufacturer Identification Code the US Coast Guard assigned to AMERICAN GENERAL MARINE — followed by a 5-character hull serial and a 4-character date code, 12 characters total. AMERICAN GENERAL MARINE hulls (1983–1984) predate the current HIN format — expect the legacy straight-year (MMYY) or model-year (M + year + month letter) date codes used 1972–1984.
Is AMERICAN GENERAL MARINE still in business?
USCG records list AMERICAN GENERAL MARINE as out of business since 1984. 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 AMERICAN GENERAL MARINE HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. AMERICAN GENERAL MARINE hulls (1983–1984) 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 WA
Sources: USCG Manufacturer Identification Code database (uscgboating.org, refreshed monthly) · HIN format per 33 CFR 181 subpart C. Cite this page: CarWhere, "AMERICAN GENERAL MARINE HIN Decoder," carwhere.com/hin-decoder/ago, last verified 2026-06-12.