Great Britain 1973 3p British Explorers (David Livingstone and Henry M Stanley) error, SG 923/4c.

A superb unmounted mint, with full original gum, se-tenant pair with turquoise-blue (background and inscription) omitted

A very scarce and visual QEII error. Pierron records 60 mint pairs.

SG Catalogue Value: £1,900+.