MARK TWAIN MARINE IND HIN Decoder — MIC MTM
Hull Identification Numbers beginning with MTM were assigned by the US Coast Guard to MARK TWAIN MARINE IND of W. FRANKFORT, IL. The company is recorded as out of business since 1991 — 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
MTM
Location
W. FRANKFORT, IL
In business
since 1972
Status
Out of business (1991)
MARK TWAIN MARINE IND built hulls across both HIN eras (1972–1991): 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 MARK TWAIN MARINE IND HIN breaks down
A current-format (1984–present) Hull Identification Number is 12 characters. Using the example MTM45678D424 (illustrative):
| Characters | Segment | In example | What it identifies |
|---|---|---|---|
| 1–3 | Manufacturer (MIC) | MTM | Identifies MARK TWAIN MARINE IND, assigned by the US Coast Guard. |
| 4–8 | Hull serial number | 45678 | MARK TWAIN MARINE IND'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 MARK TWAIN MARINE IND? Check it before you pay.
MARK TWAIN MARINE IND is recorded out of business (1991) — 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
MARK TWAIN MARINE IND HIN FAQ
What does a MARK TWAIN MARINE IND HIN look like?
It starts with the three characters "MTM" — the Manufacturer Identification Code the US Coast Guard assigned to MARK TWAIN MARINE IND — followed by a 5-character hull serial and a 4-character date code, 12 characters total. MARK TWAIN MARINE IND built hulls across both HIN eras (1972–1991): 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 MARK TWAIN MARINE IND still in business?
USCG records list MARK TWAIN MARINE IND as out of business since 1991. 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 MARK TWAIN MARINE IND HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. MARK TWAIN MARINE IND built hulls across both HIN eras (1972–1991): 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 MARK TWAIN MARINE IND 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 "MTM" MIC the same as a MARK TWAIN MARINE IND serial number?
No. "MTM" is the Manufacturer Identification Code — characters 1–3 of the HIN — that identifies MARK TWAIN MARINE IND. The hull serial number is characters 4–8: MARK TWAIN MARINE IND'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 MARK TWAIN MARINE IND 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 MARK TWAIN MARINE IND records, the title, or a marine survey to confirm the exact model and configuration.
Other builders in IL
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, "MARK TWAIN MARINE IND HIN Decoder," carwhere.com/hin-decoder/mtm, last verified 2026-06-15.