From http://forum.studebakerdriversclub.com/showthread.php?72919-Ricky-Nelson-Avanti-Serial-number-R1607-or-R1431

63R-1607 was shipped to Inglewood, CA. It was also Avanti Gold with black interior. Other equipment was supercharger, 4-speed, and Twin Traction. SOLD RUSH is on the PO.