3 Kopeken Workers with handstamped imprint "Eesti Post", block of four with two inverted imprint pairs - since the upper stamps each have an inverted imprint, postmarked "ELVA + EESTI + B 14. VIII. 41", flawless condition, expertise Thilo Nagler VP (2025) "genuine and flawless", Michel 3. 600.- (which is less than four individual stamps including the inverted imprints = 3. 700.-)