AMERICAN MATERIALS HIN Decoder — MIC JTT
Hull Identification Numbers beginning with JTT were assigned by the US Coast Guard to AMERICAN MATERIALS of SAN ANTONIO, TX. The company is recorded as out of business since 1977 — 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
JTT
Location
SAN ANTONIO, TX
In business
—
Status
Out of business (1977)
AMERICAN MATERIALS hulls (1972–1977) 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 AMERICAN MATERIALS HIN breaks down
A current-format (1984–present) Hull Identification Number is 12 characters. Using the example JTT45678D424 (illustrative):
| Characters | Segment | In example | What it identifies |
|---|---|---|---|
| 1–3 | Manufacturer (MIC) | JTT | Identifies AMERICAN MATERIALS, assigned by the US Coast Guard. |
| 4–8 | Hull serial number | 45678 | AMERICAN MATERIALS'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 AMERICAN MATERIALS? Check it before you pay.
AMERICAN MATERIALS is recorded out of business (1977) — 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
AMERICAN MATERIALS HIN FAQ
What does a AMERICAN MATERIALS HIN look like?
It starts with the three characters "JTT" — the Manufacturer Identification Code the US Coast Guard assigned to AMERICAN MATERIALS — followed by a 5-character hull serial and a 4-character date code, 12 characters total. AMERICAN MATERIALS hulls (1972–1977) 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 MATERIALS still in business?
USCG records list AMERICAN MATERIALS as out of business since 1977. 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 MATERIALS HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. AMERICAN MATERIALS hulls (1972–1977) 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 AMERICAN MATERIALS 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 "JTT" MIC the same as a AMERICAN MATERIALS serial number?
No. "JTT" is the Manufacturer Identification Code — characters 1–3 of the HIN — that identifies AMERICAN MATERIALS. The hull serial number is characters 4–8: AMERICAN MATERIALS'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 AMERICAN MATERIALS 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 AMERICAN MATERIALS records, the title, or a marine survey to confirm the exact model and configuration.
Other builders in TX
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, "AMERICAN MATERIALS HIN Decoder," carwhere.com/hin-decoder/jtt, last verified 2026-06-15.