Tristan Da Cunha 1972 Flowering Plants Top Values Die Proofs

1972 Flowering Plants 50p Tussock & £1 Tussac (SG 168&169). PROGRESSIVE DIE PROOFS of the recess printed vignette value plate in blackish green as issued. Mounted together on card (120x70mm), the 50p with central printer's mark for corrections, the £1 similar notation lower left margin. An exceptional pair. Superb, rare.