Market is very strong these days as we can see from results of Spink The Collectors Series sale 12020. This sale was held on November 14-15, 2012 with over 1200 lots. There were an interesting sections of De la Rue Dummy stamps, Australia with fine Kangaroo issues, Bermuda, British East Africa, Burma, Ceylon, Falkland Islands, Mauritius, Newfoundland with Air mails, Nyasaland, Rhodesia with "Double Heads".
Let's look at the most remarkable results. Four QEII head proofs (1953) in green on glazed paper with Bradbury Wilkinson imprint was sold for £2,500 (Lot 2). Lots 6, 7 and 9 - King Edward VII Imperium and "Nyasaland" De La Rue £10 Dummy Stamps on piece (in green and amber and in green and red) were not sold with estimates from £600 to £800 each while the similar Lot 10 but in purple and ultramarine was hammered for £1,400. Other lots from this group Lot 11 and 12 were sold for £2,400 and £1,200, respectively.