; a couple with small imperfections though a very rare set" /> Proof 1921 master and ½d. to 1/- set of twelve, thirteen die proofs in blue on various size pieces of wove paper, the master with two sets of initials and the ½d. marked as approved and<I> "Please show proofs on hard paper before hardening"</I>; a couple with small imperfections though a very rare set | Christie's