THUMPER YACHT SALES HIN Decoder
Hull Identification Numbers beginning with YAP were assigned by the US Coast Guard to THUMPER YACHT SALES of TIBURON, CA. The company is recorded as out of business since 1980 — 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
YAP
Location
TIBURON, CA
In business
—
Status
Out of business (1980)
THUMPER YACHT SALES hulls (1972–1980) predate the current HIN format — expect the legacy straight-year (MMYY) or model-year (M + year + month letter) date codes used 1972–1984.
Free · no account · the HIN is on the transom, upper starboard (right) corner
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THUMPER YACHT SALES HIN FAQ
What does a THUMPER YACHT SALES HIN look like?
It starts with the three characters "YAP" — the Manufacturer Identification Code the US Coast Guard assigned to THUMPER YACHT SALES — followed by a 5-character hull serial and a 4-character date code, 12 characters total. THUMPER YACHT SALES hulls (1972–1980) predate the current HIN format — expect the legacy straight-year (MMYY) or model-year (M + year + month letter) date codes used 1972–1984.
Is THUMPER YACHT SALES still in business?
USCG records list THUMPER YACHT SALES as out of business since 1980. 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 THUMPER YACHT SALES HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. THUMPER YACHT SALES hulls (1972–1980) 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.
Other builders in CA
Sources: USCG Manufacturer Identification Code database (uscgboating.org, refreshed monthly) · HIN format per 33 CFR 181 subpart C. Cite this page: CarWhere, "THUMPER YACHT SALES HIN Decoder," carwhere.com/hin-decoder/yap, last verified 2026-06-12.