Great Britain 1969 Investiture of HRH The Prince of Wales. 5d. multicoloured se-tenant strip of three. Variety, ‘pale turquoise -green omitted (affects the flags on all the stamps)’. Superb unmounted mint condition. David Brandon Certificate No. 35,049 (2006). QUANTITY 15 MINT STRIPS. AN EXCEEDINGLY RARE AND IMPORTANT ERROR.