or "May 1920" (2/- and 4/-). A unique group. Photo" /> Proof 2/- to £1 set of six frame proofs, each stamp-size in black on glazed card and affixed to two De La Rue day book pieces with details of leads taken, all crossed through in red ink and dated<I> "Nov 9th 1917"</I> or<I> "May 1920"</I> (2/- and 4/-). A unique group. Photo | Christie's