The manufacturer identification code (MIC) of your craft identification number (CIN or HIN) is ISB. This MIC (ISB) stands for the company name Islands Small Boat Works which is currently In Business. This boat manufacturer code has other company names (ISB sometimes goes by these name(s) if applicable: , , , or Irwins Spec Boats Usa - Oob). This could happen if the US Coast Guard reissued the MIC to a new company after the first went out of business.
This company (Islands Small Boat Works) is owned by John Heemsath and is located at Po Box 1053 in Palm City state of Fl. It manufactured this vessel and placed your HIN or CIN on the hull. This Boat maker is not owned by a parent company. Islands Small Boat Works has started making boats, yachts or other watercraft as of 1/25/2011.
More details at the US Coast Guard.
The US Coast guard provides this comment about this watercraft manufacturer: Sailboatsoob 4/88 Re Rbsu(w) Irwins Spec Boats Usa (carson Ca) Ib-6/11/1981 Oob-4/25/1988..