Russian Federation - 1917 - Mi. 78 Ax U o, Mint MNH - Error: The top imperforate stamps - RARE

Russian Federation 1917 - Mi. 78 Ax U o, Mint MNH; Right edge of the sheet with the printed blank field (two-tone chevrons) - Error: The top imperforate stamps

Russia 1917
Mi. 78 Ax U o
Mint MNH
Right edge of the sheet with the printed blank field (two-tone chevrons)
Error: The top imperforate stamp
Expertised: L. Hovest.
Due to this errors, the stamp has a very high value.
Estimated value: €800

All my stamps are 100% genuine and come with certificates or have an expert signature.
The certificate was translated with Google Image - Translate, so there might be translation errors (see photo).

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