Could this 6 kopeek, USSR ,(1923-Sc #255 ?) stamps be on some type of colored paper with watermark 170 ? It's suppose to be on white paper. The catalog doesn't indicates a colored paper or watermark been used for this issue or it's from a later series with the same design. There is also a small wrinkled yellow smudge on the front side of the stamp. Could this be this be a part of the gum?
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