Black stamp ink surcharge. Secret signs: The left vertical line of the frame goes down by 0.2 - 0.5 mm, and in the right corner the lower inner horizontal line of the frame goes to the right by about 0.2 mm. Most stamps have both marks, but some do not have one of them. For all stamps, dark background lines appear on the light ornament in the lower part of the ornamented frame, two of which cross the outer line of the frame. Attention! Stamps without secret signs are forgery.
Not issued, but was sold unofficially on the black market. Secret signs: The left vertical line of the frame goes down by 0.2 - 0.5 mm, and in the right corner the lower inner horizontal line of the frame goes to the right by about 0.2 mm. Most stamps have both marks, but some do not have one of them. For all stamps, dark background lines appear on the light ornament in the lower part of the ornamented frame, two of which cross the outer line of the frame. Attention! Stamps without secret signs are forgery.
