RIGA (Latvia): 10 kopeck brown and blue, horizontal pair with good to large margins, tied by pen crosses to letter sheet to Pernau with reverse side dispatch mark "RIGA 10 FEB. 1858" and bilingual arrival mark. The right stamp with very minor and unobtrusive diagonal bend, still very fine and most attractive. An extremely rare franking. Certificates Mikulski (1995) and Citerne BPP (2026)