The Bluegrass series of instruments were the first mandolins to be introduced after production moved to Japan. These models included the BG-50, which was a Gibson A-style with f-holes, and the BG-440, which was an F-style Florentine model with an oval soundhole. The BG-440 is consideralby more expensive than the BG-50, but due to lack of information and circulation, it is tough to put a price on these instruments.