For modern Eko guitars (roughly 2010–present), including all 2021 production, serial numbers are typically and follow a logic based on production origin:
Modern Eko serial numbers are typically printed on a label inside the soundhole (for acoustics) or on the back of the headstock/neck plate (for electrics). They usually follow an alphanumeric format like or S##### . eko guitar serial number lookup 2021
Early electrics used small plastic-covered pickups with gold foil inserts. By the 1970s, Eko transitioned to larger humbuckers and standard single-coils with exposed metal poles. For modern Eko guitars (roughly 2010–present)