series guitars were high quality guitars and featured the 'RXXXXXX' serial numbers.
RICH N.J.: R2xxx to R8xxx, R83xxxx to R92xxxx series have a single humbucker pickup and Kahler tremolo. series were all made from Mahogany with a rosewood fingerboard and dot inlays.
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.
