ET-3AZ 1928 Estonia

ES3CX ( TE2WA, T2X , ESX6C, ES6C)- Vitali Suigussaar,
ET3AZ ( TE2OL, TE-4L, ES3P) - Karl Olof Leesment and
ET3XY (TE-XX)- Eugen Tumma
were first radio amateurs in Estonia,
first 2 way QSO's in 1924-1925.

Courtesy of ES7GZ