The manufacturer identification code (MIC) of your craft identification number (CIN or HIN) is GSR. This MIC (GSR) stands for the company name Kevfin Kustoms which is currently In Business. This boat manufacturer code has other company names (GSR sometimes goes by these name(s) if applicable: , , , or Gulfstream Boat Builders Inc - 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 (Kevfin Kustoms) is owned by Kevin M. Mueller and is located at 110 W Main St in Rockton state of Il. It manufactured this vessel and placed your HIN or CIN on the hull. The Parent Company for this boat maker is GEM SHOP & DIAMOND SRC LLC()Kevfin Kustoms has started making boats, yachts and other watercraft as of 8/9/2011.
More details at the US Coast Guard.
The US Coast guard provides this comment about this watercraft manufacturer: 'gsr' Was Sommer Boat Works, Oakland, Ca; Oob 4/805/91 Pmrbought Out By Mep; Gsr Oob On This Date 911007; Cg-5093 Mia. Gulfstream Boat Builders Inc (opa Locka Fl) Ib-5/8/1989 Oob-10/7/1991..