60 copies on 60 copies of workers, the very rare proof print on a labeled registered letter "PSKOW 68" has a genuine overprint, the Cyrillic postmark strikes are also genuine, the letter has not been transported by mail, the stamp is in perfect condition! Great rarity of the area, unsigned and photo certificate Walter Zirath BPP: "... No defects are visible. The perforation is typical for this issue. This is a rare proof print. The edition consists of only 24 copies.", Michel 4,000.-