Lot 1461 GREAT BRITAIN - ELIZABETH II

1961 Seventh Commonwealth Parliamentary Conference vertical strip of four unmounted mint (top stamp showing small paperclip indentation) with gold omitted from top stamp and partially progressively on the remaining three stamps (second stamp almost completely omitted, last two less so and mainly on the left side), complete with BPA 2014 certificate stated as genuine. Rare and important error on 30 mint examples believed to exist! SG 629a Cat £1800 for first error, plus partial omitted on remaining three stamps.