Collectors often seek "early" units (low serial numbers) or units from the final production run in 1995 for their historical value.
To check the serial number on a Korg M1 is to read its biography. It tells you where it was born, when it was built, and what quirks it might have inherited. For the discerning synthesist, that little sticker is not just a number—it is the instrument’s DNA. Korg M1 Serial Number