Check the listing for details. FS850 Acoustic Guitar. Condition: Open box. Listed at 467.49 USD. The Yamaha FS850 is a grand auditorium size acoustic guitar. Smaller than a dreadnought, most players find the FS850 to be very comfortable, and it produces a smooth, sweet sound with strong mid-range. The FS model body is 10mm slimmer than that of the FG body, offering increased comfort and playability with no loss of volume or bass.Perfect for home, studio, or stage, the FS850 has all the traditional appointments you are looking for. The all-Mahogany body produce a warm tone filled with all the subtleties you want in an acoustic Grand Auditorium-style guitar. The Yamaha FS850 Acoustic Guitar is a perfect choice for singer/songwriter performers as well as student level players. The solid Mahogany neck sports a fast, thin profile that is easy and comfortable to play. The 20 fret rosewood.