Korg M1 Serial Number

Open up an early M1, and you might see reddish-brown crust on the screws and metal chassis. This isn't rust. It's a waxy, corrosive glue Korg used to prevent screws from vibrating loose on 1988 models. Over time, this glue absorbs moisture, becomes acidic, and eats through traces on the motherboard.

Korg placed the serial number in two locations on the M1:

Korg's serial numbers can vary in format, but they often consist of a combination of letters and numbers. The exact interpretation of the serial number format can be complex and may involve specific codes for production dates or batch numbers. However, Korg's serial numbers typically do not follow a straightforward, universally understandable pattern. Korg M1 Serial Number

There are two places you should check for the serial number:

Rarely. There are plenty of fake Korg MS-20s and Minilogues, but the M1 is too complex to clone cheaply. The only "fake" serials you see are on Chinese replacement back panels. If the sticker looks brand new, glossy, and has a QR code—it's a reproduction. Open up an early M1, and you might

These are the last M1s ever made. They have the best keybed action, updated operating system 2.0 (supports more RAM), and typically came with the "M1R" expansion board.

The first step in understanding the M1’s lineage is understanding the format of its serial number. Unlike the purely numeric sequences found on many competitors’ gear (like the Roland D-50), Korg employed an alphanumeric system for the M1. A typical serial number will look something like this: 106081 (an early Japanese unit) or 001650 (a very early production model). These are the last M1s ever made

Crucially, the prefix numbers are the most significant digits. For the vast majority of M1s, the first digit or first two digits indicate the year of manufacture, while the subsequent digits represent the unit’s sequential production number for that year.

It is important to note that the M1 sold in such massive numbers that Korg did not reset the serial counter at the beginning of each year. Therefore, a serial number like 223456 is simply the 23,456th unit built since production began, not the 23,456th unit of 1989. However, because we know the total production run (roughly 250,000 units) and the annual sales peaks, we can approximate: serial numbers up to ~80,000 are likely 1988, numbers from 80,001 to ~180,000 are 1989, and numbers above 180,000 are 1990-1991.