Auction 309-320 - Great Britain 1840–1841 Europe & Overseas - Day 5

1856/1864,  2 a. yellow-green, unused, variety imperforate, no wmk., without gum, four good to large margins, stamp prepared for use but never officially issued, a rare stamp. Cert. BPA (2006).  SG50a = £9'000 for an imperf pair.