

These guitars have a consistent serial number line with the first two numbers being the year.The serial number is usually a sticker on the back of the headstock.
YAMAHA BASS GUITAR SERIAL NUMBER LOOKUP FULL

The only custom option you could order on these guitars was the electronics, however many did come with custom graphics.Production Series in the catalogs but received the nickname "U series" due to being recognized by the letter U before the serial number stamped in the back of the headstock. These Models look like USA guitars with the "R" logo, but had dot inlays and a serial number that started with "U".Said to have higher quality parts than NJ guitars.These guitars were machine made in Japan and assembled in the USA.
