cover 1900 (21 Jan.) disinfected envelope (Dutch Legation corner card) (some slight staining) to Holland bearing "Kitai" 10k. cancelled by single ring d.s. (Type 4) with "OBEZZARASHENO" (disinfection) h.s. in Cyrillic adjacent, showing Troitsko-Savsk (Mongolia) and Dutch arrival c.d.s. on reverse. Very scarce and interesting. Photo