This paper examines the three main serial number formats found on Korg M1 keyboards, cross-references them with known manufacturing periods, and discusses their utility and limitations. Based on empirical data from existing units, service manuals, and owner reports, three distinct formats appear:
S/N 3512876 Assembled in Italy
KORG INC. MODEL M1 SERIAL 078234 MADE IN JAPAN Typical Format C sticker: Korg M1 Serial Number