GREAT BRITAIN 1960 GENERAL LETTER OFFICE FIRST DAY COVER, LONDON WC
Tercentenary of Establishment of General Letter Office set on illustrated cover with LONDON, WC circular cancel dated 7 UY 60, the first day of issue. Note the month slug error 'UY' instead of 'JY'. Scarce thus. Generally fresh and fine. SG619-620; SC375-376
