The G-Sharp OF-1 travel guitar was first developed by Øivin Fjeld, a Norwegian music teacher. The OF-1 is a short-scale guitar and once tuned to g# and  has been manufactured since 2005 and over 4,000 produced circa 2016.  Øivin made a deal with Norwegian-turned-American businessman, Frank Pedersen, whom he knew from his youth and in 2014 G-Sharp company moved from Fredrikstad, Norway to a new home in Pleasanton, Kansas USA. Frank Pedersen and his son, Alex, have now taken charge of the company.

Source: G-Sharp guitars website