This is a vintage 1980 Eko B.A/4 (BA.4N) 4-string fretless acoustic bass guitar. This example, with no stamped serial number on the paper label, is in absolutely pristine 100% all original condition with the original oversized hard case. With the original strings still installed and highly preserved, this instrument is in mint cosmetic condition. It plays absolutely perfectly, and sounds surprisingly great. The neck is straight, and the entire instrument is without issues. This is likely one of the best examples ever showcased online.