40a lilac stamp is a spectacular Icelandic definitive issue. The unique block of four 40a lilac stamps is especially valuable and popular among stamp collectors. Of the 40 recorded examples, this is one of only two known blocks, with 1985 Beskow, 1999 and 2003 Moller certs. The 40a were virtually all overprinted “I Gildi” (“valid”) and only handful managed to reach collectors. This true showpiece of Icelandic philately was sold for $26,000 at Cherrystone auction that took place in June, 2006.