On some production runs or regional variants, a secondary serial number sticker was placed on the metal bottom plate near the edge.
Your serial number dictates what internal hardware your Korg M1 possesses. This is crucial information if you plan to upgrade or repair your synth. Checking Firmware Without Opening the Synth
The Korg M1 is the best-selling digital synthesizer in music history. Released in 1988, it defined the sound of late-80s pop, early-90s house, and countless film scores. Because Korg manufactured an estimated 250,000 units during its production run, thousands of these iconic workstations are still circulating in the used market today.
The serial number is often relevant when performing maintenance or upgrading firmware. To check your M1's internal software version: Turn the power . Press and hold the [INT] button. Turn the power ON . Korg M1 Serial Number
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 lucky enough to buy a "box opened" or "new old stock" (NOS) unit, the serial number will be printed on the outside of the original cardboard shipping box. Check the warranty card inside the original manual binder as well, as dealers usually stamped these at the point of sale. 2. Decoding Korg's Serial Number System
Korg placed the serial number in two primary locations on the M1 chassis. On some production runs or regional variants, a
The Korg M1 serial number contains valuable information about your instrument, including its production date, factory, and model year. Here's a breakdown of the serial number format:
The is a tiny sticker that holds immense power. Whether you are a collector trying to verify a 1988 vintage unit, a buyer trying to avoid a rebuilt franken-synth, or a seller justifying a high price, that sequence of digits is your truth.
Origins and production context
Production began slowing down as newer workstations like the Korg T-series and 01/W entered the market. Units built in this window usually feature the final firmware revisions (v19 or v23).
: On some production runs, a duplicate serial number sticker or a stamped ink sequence is located on the bottom metal casing of the unit.
Every original Korg M1 has an internal battery that preserves your custom sounds and settings. After nearly 35-40 years, . A dead battery manifests as a failure to save programs or combinations after power-off. If you don't know when it was last replaced, it should be done immediately by a qualified technician, as a leaking battery can severely damage the internal circuit board. Replacing the battery is a standard procedure, and the factory settings can be easily reloaded afterward via a MIDI SysEx dump. Checking Firmware Without Opening the Synth The Korg
Unlike some manufacturers, Korg didn’t use a straightforward “YYMMDD” system. However, a clear pattern exists based on cumulative production.
Because Korg has never officially released their vintage production archives, the synthesizer community has reverse-engineered M1 production dates by matching serial numbers with original purchase receipts and component date codes.