, initialled and dated "2/11/28" at foot; light mark at right well clear of the design. Photo" /> Proof Master in the issued design, in blue on wove paper (66 x 70mm.) with printer's imprint at top, marked<I> "Approved"</I>, initialled and dated<I> "2/11/28"</I> at foot; light mark at right well clear of the design. Photo | Christie's