Black stamp ink surcharge. Secret sign: At a distance of 5.9 mm below the upper right corner of the stamp - one, barely noticeable, thin horizontal line of hatching of the background protrudes to the right beyond the frame line by about 0.3 mm. Attention! Stamps without secret signs are forgery.
Not issued, but was sold unofficially on the black market. Secret sign: At a distance of 5.9 mm below the upper right corner of the stamp - one, barely noticeable, thin horizontal line of hatching of the background protrudes to the right beyond the frame line by about 0.3 mm. Attention! Stamps without secret signs are forgery.
