1 Rouble \"20th Anniversary of the Storming of the Perekop Isthmus\" with black two-line hand stamp overprint \"Eesti post\", neat cancelled \"ELVA+EESTI+B ?.? VIII. 41\" on piece, rare stamp, issued only 200 piece, expertized Keiler BPP, H. B. Zierer and photo expertize Krischke BPP: \"genuine and immaculate\", Michel 800.-