Sudan 1921 Die Proof Set 1M - 15M Before Striking, Rare

1921-23 Full Set of DIE PROOFS for Arab Postman 1m - 15m (SG 30-36). The set of 7 frame plate die proofs in black on glazed card variously dated (in manuscript) and each marked BEFORE STRIKING. VF, a rare - likely impossible to replicate - group for this elusive state of the dies.