From Jeff’s post a while back….
Every 3-MIL from the beginning, even the RAT Cutlery ones, were serialized from the beginning. Each serial number was for one knife regardless of style. Same with all Izulas. When we changed the name to ESEE Knives then we started serializing the 3, 4, etc. But again, that serial number is consecutive regardless of the color of the knife, etc.
Except for the HEST, arrowhead and the Lite Machete, all ESEE Knives have a serial number.