PITCAIRN ISLANDS 1966 (FDC) INAUGURATION OF WHO HEADQUARTERS
Inauguration of WHO Headquarters bottom right corner plate 1B–1B–1B blocks x 4 on separate illustrated unaddressed covers each with PITCAIRN IS, FIRST DAY circular cancel dated 20 SP 66, the first day of issue. Very scarce. Fine. SG59/60; SC62/63
