| Serial Range (Approx.) | Likely Production Year | Notes | |------------------------|------------------------|-------| | 100000 – 150000 | 1988 – 1989 | Early units; still use original factory presets. | | 150001 – 210000 | 1990 – 1992 | Peak production years. | | 210001 – 260000 | 1993 – 1995 | Later units; may have updated ROM or minor hardware revisions. |

For digital versions, the serial number is required to associate an owner with a unique user account on KORG USER NET . Summary Table: Estimated Production Timeline Serial Number Range Estimated Production Year 000001 – 050000 1988 – 1989 050001 – 100000 1989 – Nov 1990 100001 – 175000 1991 – 1993 175001 – 250000 1993 – 1995 Korg M1 - what model? - Vintage Synth Explorer Forums

For the hardware Korg M1 synthesizer , the serial number is typically located on the bottom casing of the unit. For the Korg M1 software plugin

: A lush, atmospheric pad that showcased the unit's "AI" (Advanced Integrated) Synthesis System [6, 24].