Look at the of the synthesizer. The serial number is printed on a rectangular silver or white sticker located near the power inlet, MIDI ports, or the main audio outputs. It typically sits next to the factory text indicating the model name ("MUSIC WORKSTATION M1") and manufacturing origin ("MADE IN JAPAN"). Internal PCB Markings
Korg did not stamp production dates directly onto the chassis. The serial number helps narrow down the manufacturing year (1988–1995). Korg M1 Serial Number
It's worth noting that vintage units often have dead internal batteries, which can cause them to lose their factory sounds. If you discover this, you can find guides online for replacing the battery and reloading the original data, but knowing your serial number is the first step in this restoration journey. Look at the of the synthesizer
Pristine condition units with exceptionally low serial numbers (under 15,000) fetch a premium from vintage synth collectors who want "first-year" launch models. Internal PCB Markings Korg did not stamp production