Lot 50057 – Guatemala – 1881 Issue 2c inverted quetzal, group of

Guatemala – 1881 Issue 2c inverted quetzal, group of twelve items including six exposure trials of the 20c used to very likely caliber the settings to work after on a 2c, two exposure trials of the 2c only with the frame, and one exposure trial of the quetzal alone, one cliché on celluloid of the target cancellation and two associated essays on paper, in addition some auction catalogue cuttings from this rarity; a remarkable and unique selection of Sperati’s workmanship in calibrating his reproduction of the 2c; one example of exposure trial of the 20c is known in the Paris Postal Museum and is depicted in Sperati II.