Lot no. 7001 °

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1857, "1" watermark proof, complete sheet of 100, comprising 4 panes of 25, showing the position layout and watermarked inscriptions "POCHTOVAYA MARKA IN 10 KOPECK 1857". Folded between the groups and small marginal faults. A unique  and most important item of Russian philately. Certificate Citerne BPP (2026)

Provenance: Fabergé (Harmer,1939)  Baughman (Siegel,1971)  Bianchi (Investphila, 2008).

Note: The Russian Postal Museum owns similar sheets with watermarks “2” and “3”