APPONAUG HARBOR MARINA HIN Decoder — MIC AHM
Hull Identification Numbers beginning with AHM were assigned by the US Coast Guard to APPONAUG HARBOR MARINA of WARWICK, RI. The company is recorded as out of business since 1982 — 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
AHM
Location
WARWICK, RI
In business
since 1976
Status
Out of business (1982)
APPONAUG HARBOR MARINA hulls (1976–1982) predate the current HIN format — expect the legacy straight-year (MMYY) or model-year (M + year + month letter) date codes used 1972–1984.
How a APPONAUG HARBOR MARINA HIN breaks down
A current-format (1984–present) Hull Identification Number is 12 characters. Using the example AHM45678D424 (illustrative):
| Characters | Segment | In example | What it identifies |
|---|---|---|---|
| 1–3 | Manufacturer (MIC) | AHM | Identifies APPONAUG HARBOR MARINA, assigned by the US Coast Guard. |
| 4–8 | Hull serial number | 45678 | APPONAUG HARBOR MARINA'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 APPONAUG HARBOR MARINA? Check it before you pay.
APPONAUG HARBOR MARINA is recorded out of business (1982) — 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
APPONAUG HARBOR MARINA HIN FAQ
What does a APPONAUG HARBOR MARINA HIN look like?
It starts with the three characters "AHM" — the Manufacturer Identification Code the US Coast Guard assigned to APPONAUG HARBOR MARINA — followed by a 5-character hull serial and a 4-character date code, 12 characters total. APPONAUG HARBOR MARINA hulls (1976–1982) predate the current HIN format — expect the legacy straight-year (MMYY) or model-year (M + year + month letter) date codes used 1972–1984.
Is APPONAUG HARBOR MARINA still in business?
USCG records list APPONAUG HARBOR MARINA as out of business since 1982. 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 APPONAUG HARBOR MARINA HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. APPONAUG HARBOR MARINA hulls (1976–1982) 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.
Where is the HIN on a APPONAUG HARBOR MARINA 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 "AHM" MIC the same as a APPONAUG HARBOR MARINA serial number?
No. "AHM" is the Manufacturer Identification Code — characters 1–3 of the HIN — that identifies APPONAUG HARBOR MARINA. The hull serial number is characters 4–8: APPONAUG HARBOR MARINA'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 APPONAUG HARBOR MARINA 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 APPONAUG HARBOR MARINA records, the title, or a marine survey to confirm the exact model and configuration.
Other builders in RI
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, "APPONAUG HARBOR MARINA HIN Decoder," carwhere.com/hin-decoder/ahm, last verified 2026-06-15.