30 Kopecks workers with hand stamp overprint "Eesti post", block of four with two overprint tete-beche pairs - there each a upper respectively lower stamp inverted overprint shows, cancelled "ELVA plus EESTI plus B 14. VIII. 41", very fine, expertise Thilo Nagler VP (2025) "genuine and immaculate", Michel in cancelled condition not listed! with the two different tete-beche variants spectacular piece!