The manufacturer identification code (MIC) of your craft identification number (CIN or HIN) is GSK. This MIC (GSK) stands for the company name Gamma Sports Inc which is currently Out of Business. This boat manufacturer code has other company names (GSK sometimes goes by these name(s) if applicable: , , , or ). This could happen if the US Coast Guard reissued the MIC to a new company after the first went out of business.
This company (Gamma Sports Inc) is owned by J E Granville and is located at Po Box 726 in Belmont state of Ca. It manufactured this vessel and placed your HIN or CIN on the hull. This Boat maker is not owned by a parent company. Gamma Sports Inc has started making boats, yachts and other watercraft as of 4/2/1981 and went out of business on (4/6/1983) in the following country: USA.
More details at the US Coast Guard.
The US Coast guard provides this comment about this watercraft manufacturer: Importing.