UNION BAY FABRICATION HIN Decoder — MIC UNB
Hull Identification Numbers beginning with UNB were assigned by the US Coast Guard to UNION BAY FABRICATION of SEATTLE, WA. The company is recorded as out of business since 2012 — 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
UNB
Location
SEATTLE, WA
In business
since 2006
Status
Out of business (2012)
UNION BAY FABRICATION hulls (2006–2012) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
How a UNION BAY FABRICATION HIN breaks down
A current-format (1984–present) Hull Identification Number is 12 characters. Using the example UNB45678D424 (illustrative):
| Characters | Segment | In example | What it identifies |
|---|---|---|---|
| 1–3 | Manufacturer (MIC) | UNB | Identifies UNION BAY FABRICATION, assigned by the US Coast Guard. |
| 4–8 | Hull serial number | 45678 | UNION BAY FABRICATION'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 UNION BAY FABRICATION? Check it before you pay.
UNION BAY FABRICATION is recorded out of business (2012) — 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
UNION BAY FABRICATION HIN FAQ
What does a UNION BAY FABRICATION HIN look like?
It starts with the three characters "UNB" — the Manufacturer Identification Code the US Coast Guard assigned to UNION BAY FABRICATION — followed by a 5-character hull serial and a 4-character date code, 12 characters total. UNION BAY FABRICATION hulls (2006–2012) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
Is UNION BAY FABRICATION still in business?
USCG records list UNION BAY FABRICATION as out of business since 2012. 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 UNION BAY FABRICATION HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. UNION BAY FABRICATION hulls (2006–2012) 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 UNION BAY FABRICATION 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 "UNB" MIC the same as a UNION BAY FABRICATION serial number?
No. "UNB" is the Manufacturer Identification Code — characters 1–3 of the HIN — that identifies UNION BAY FABRICATION. The hull serial number is characters 4–8: UNION BAY FABRICATION'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 UNION BAY FABRICATION 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 UNION BAY FABRICATION records, the title, or a marine survey to confirm the exact model and configuration.
Other builders in WA
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, "UNION BAY FABRICATION HIN Decoder," carwhere.com/hin-decoder/unb, last verified 2026-06-15.