1866, 10 Pen. black on buff, perf. III / C in horizontal strip of three on envelope (roughtly opened on lower left side) sent from ABO 20.2.1870 to Helsinfors, a very fine strip with almost complete perforation, cert Peter Holcombe (1995) (Katalog-Nr.: Mi. 7xC(3),SG 22(3), Sc.13(3))