Claymo Probe Master of the Great Ustig - Igumnov Nikolai Matveyev - initials N-I - 1827-1834.

Stamp with the image of the initials of the assay master Nikolay Matveev Igumnov. In the upper part of the stamp, the initials "H" and "I" are indicated, with an ampersand between the letters. There is a line passing through the middle of the stamp. The year "1839" is indicated in the lower part. The master is also the son of Matvey Ivanovich Igumnov (1827-1837). Shape: Rectangle.