On acoustic models, a paper label inside the soundhole typically lists the "Modello" (model) and occasionally a serial number.
For many Italian-made electric and bolt-on acoustic models (like the vintage Ranger series), the serial number is often engraved on the metal plate where the neck bolts to the body. eko guitar serial number lookup 2021
Some bass models may have numbers located under the intonation screws on the bridge. Decoding Eko Serial Numbers On acoustic models, a paper label inside the