CONCEPT HOLDING CORP HIN Decoder — MIC KOH
Hull Identification Numbers beginning with KOH were assigned by the US Coast Guard to CONCEPT HOLDING CORP of HIALEAH GARDEN, FL. The company is recorded as out of business since 1988 — 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
KOH
Location
HIALEAH GARDEN, FL
In business
since 1986
Status
Out of business (1988)
CONCEPT HOLDING CORP hulls (1986–1988) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
How a CONCEPT HOLDING CORP HIN breaks down
A current-format (1984–present) Hull Identification Number is 12 characters. Using the example KOH45678D424 (illustrative):
| Characters | Segment | In example | What it identifies |
|---|---|---|---|
| 1–3 | Manufacturer (MIC) | KOH | Identifies CONCEPT HOLDING CORP, assigned by the US Coast Guard. |
| 4–8 | Hull serial number | 45678 | CONCEPT HOLDING CORP'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 CONCEPT HOLDING CORP? Check it before you pay.
CONCEPT HOLDING CORP is recorded out of business (1988) — 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
CONCEPT HOLDING CORP HIN FAQ
What does a CONCEPT HOLDING CORP HIN look like?
It starts with the three characters "KOH" — the Manufacturer Identification Code the US Coast Guard assigned to CONCEPT HOLDING CORP — followed by a 5-character hull serial and a 4-character date code, 12 characters total. CONCEPT HOLDING CORP hulls (1986–1988) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
Is CONCEPT HOLDING CORP still in business?
USCG records list CONCEPT HOLDING CORP as out of business since 1988. 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 CONCEPT HOLDING CORP HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. CONCEPT HOLDING CORP hulls (1986–1988) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits. Enter the full 12-character HIN above and the decoder works it out, including the legacy formats.
Where is the HIN on a CONCEPT HOLDING CORP 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 "KOH" MIC the same as a CONCEPT HOLDING CORP serial number?
No. "KOH" is the Manufacturer Identification Code — characters 1–3 of the HIN — that identifies CONCEPT HOLDING CORP. The hull serial number is characters 4–8: CONCEPT HOLDING CORP'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 CONCEPT HOLDING CORP 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 CONCEPT HOLDING CORP records, the title, or a marine survey to confirm the exact model and configuration.
Other builders in FL
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, "CONCEPT HOLDING CORP HIN Decoder," carwhere.com/hin-decoder/koh, last verified 2026-06-15.