A project of Esperanto Music History by Thomas Preece.
Miŝo Zdravev
1976, 7" single, 2 tracks
Balkanton — BTK 3313
A. La Unua Tago de la Printempo B. Mia Gitaro
The Laŭjara Katalogo and Esperanto Wikipedia both give a date of 1971. However, official-looking versions on YouTube and Spotify give a date of 1976.
Esperanto Music DatabaseEsperanto Music Database