STILL WATER DESIGN HIN Decoder
Hull Identification Numbers beginning with SWN were assigned by the US Coast Guard to STILL WATER DESIGN of CHELSEA, MA. The builder is listed in the USCG MIC database. Enter the full 12-character HIN below for build date, model year, and serial — free, no account.
MIC
SWN
Location
CHELSEA, MA
In business
since 1994
Status
Listed active in USCG records
STILL WATER DESIGN hulls (1994–present) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
Free · no account · the HIN is on the transom, upper starboard (right) corner
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STILL WATER DESIGN HIN FAQ
What does a STILL WATER DESIGN HIN look like?
It starts with the three characters "SWN" — the Manufacturer Identification Code the US Coast Guard assigned to STILL WATER DESIGN — followed by a 5-character hull serial and a 4-character date code, 12 characters total. STILL WATER DESIGN hulls (1994–present) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
Is STILL WATER DESIGN still in business?
USCG records list STILL WATER DESIGN of CHELSEA, MA in the MIC database (registered 1994).
How do I decode the year on a STILL WATER DESIGN HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. STILL WATER DESIGN hulls (1994–present) 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.
Other builders in MA
Sources: USCG Manufacturer Identification Code database (uscgboating.org, refreshed monthly) · HIN format per 33 CFR 181 subpart C. Cite this page: CarWhere, "STILL WATER DESIGN HIN Decoder," carwhere.com/hin-decoder/swn, last verified 2026-06-12.