: Enthusiast databases, such as the ZASM Korg Serial Reference , track thousands of M1 serials, showing common sequences starting with "0" (e.g., 013537) up to "2" (e.g., 215725). Digital Alternatives: M1 Le and VST Product Codes Korg M1 (Retrozone) - Sound On Sound
Korg did not use a standardized public date-coding system like some other manufacturers (e.g., Roland’s YYMMDD format). However, based on collector data and repair logs, general patterns emerge. Korg M1 Serial Number
Many M1s have a serial number starting with a zero (e.g., 008765 ). This is not a 5-digit number. Korg used a fixed width in their database. 008765 is simply serial number 8765 — an extremely early unit, likely manufactured in late 1987 or January 1988. Do not ignore the leading zeros. : Enthusiast databases, such as the ZASM Korg