1920 (11 Jan) British army cover ("This envelope to be Returned to Bearer") franked on back with pairs of 10k and 15k Russian Currency stamps, tied by "Keskevero" (Olonetz, Aunus) cds, addressed to the Medical Chief of the Sanitary Train No.1 in the Archangelsk region (under British Occupation), with Russian Field Post markings applied on arrival, some cover toning, rare usage (Image)

Est.$250