Korg M1 Serial Number May 2026

Unlike modern synths with complex date codes (YMDD), the M1 uses a relatively simple, albeit inconsistent, system. There are three distinct eras.

If you are buying or selling a Korg M1, the serial number can swing the price by $100-$300. Here is why.

The M1 is so iconic that counterfeit units are rare, but non-working parts units sometimes get reshelled. A missing or oddly formatted serial sticker can indicate a repair or frankenstein build. Korg M1 Serial Number

Perhaps the most intriguing mystery for M1 owners is the unit that lacks a serial number entirely. This happens for several reasons:

If you find an M1 with no serial number, proceed with extreme caution. It is likely either a very rare collectible (if it has other prototype traits, like a different case color or silkscreening) or, more commonly, a unit with a dubious history involving theft or unlicensed repairs. Unlike modern synths with complex date codes (YMDD),

The Korg M1 is more than just a synthesizer; it is a historical artifact. Released in 1988, it remains the best-selling keyboard synthesizer of all time, shifting over 250,000 units. If you own one—or are looking to buy one—the Korg M1 serial number is the single most important piece of data attached to your instrument. It is the key to unlocking its manufacturing date, authenticity, hardware revision, and current market value.

In this deep-dive article, we will explore exactly how to decode the Korg M1 serial number, why it matters for collectors and musicians, and how to spot a fake or a "transition" model. If you find an M1 with no serial

Some very late M1s (mostly the M1EX or M1R rackmount) feature a letter prefix like A or B. Example: A01234.
This appears to indicate:

Unfortunately, Korg Japan has never released an official decoder, so letter prefixes remain a “best guess” for enthusiasts.