30 Kop. Postal stamp \"workers\" with hand stamp overprint \"Eesti post\", variety \"inverted overprint\", unused with original gum and slight hinge trace in good condition (two perforation soiled, in total slightly disordered perforation). The total edition of this stamp amounts to only 400 pieces - varieties with inverted overprint are very rare, the stamp is one of the rarities of the German occupation issues in the II. World war. Photo expertize Gerhard Krischke and photo expertize Thomas Loebbering BPP (2023).