Yamaha SG-510 modified sheet music circa 1980s,

Good condition, 6,5/10, Made in Japan, some fret wear, including black Epiphone hardcase, the model number is a qualified guess but seems correct considering the headstock inlay and the dots markers, has been heavily modified by someone, the top has been covered with sheet music and the non-original pickups are a mismatch, not sure what brand, original Yamaha chrome tuners, lyre engraved stoptail, 4 black knobs, unreadable serial number, black neck and volute on the back of the headstock, more info:

"The Yamaha SG-510 was introduced in 1984 as a follow up to the earlier Yamaha SG-300 and Yamaha SG400 that were issued in 1978-1979 as an addition to the initial Yamaha SG line up. Yamaha SG500, 700, 1500 and 2000 that were produced since 1976. The SG-510 was produced in red, black and a special issue in blue, with the blue being the rarest and referring to the famous Japanese guitarist Noyori Takanaka. The SG-510 is a light-weight and excellent guitar and its flat design and lighter weight makes it easy to play, it has low action with a powerful sound from 2 high output double humbuckers. A black version of this guitar was used by Andy Taylor of Duran Duran on the live recordings of “Rio”."