Rare Russian 18k Definitive Issue
September 04, 2018
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18k pair definitive issue. Image of Raritan Stamps.
The origin of the 18k imperforated stamp is not clear. Perhaps, this stamp with a vertical chalk network is a probe. And the same stamp without a chalk network - from accidentally imperforated sheets or from sheets of probes with a strong shifted chalk network.
The stamp was sold in small quantities at philatelic stores in 1927. Known copies from one or two sheets. There are philatelic covers with the imperforated probe 18k, dated in spring and summer of 1928.
In modern catalogs, these stamps are placed in the category of probes.