This guitar was bought used, in the early 90s. Its serial numbers indicates that it was built 1990.
I'm trying to find out the model name in order to try and find a user manual that describes the pickups and controls.
(I have added the connection to the bridge myself to avoid noice)
Interesting, never seen one of these. Probably made for the Japanese market. Body looks like the S shape. If it's American/International market, it would have been called the "SFRB-421" or something close to that. The Japanese market models didn't have a clear naming convention.
https://samick.fandom.com/wiki/S
