Karpenision error: 1861 Provisional printing of 20l without control figures (pos.10), deep ultramarine with solid background and with 9mm experimental figures printed inverted and reversed at the back (Kound. 12.1), tied by "44" Karpenision cds. Stamp touched at two sides and creased. Only three stamps are known, one believed to be lost during WWII. A very important rarity for Greek philately. Certificate Tseriotis (2003). (Hellas 8III).