Lot Essay
See Erwin Baumgartner, Glas des Mittelalters und der Renaissance Die Sammlung Karl Amendt, Dusseldorf, 2005, p. 68, no. 4 for a related beaker of uncertain origin with a similarly coloured metal and pp. 86-87, nos. 24 and 25 for two examples of watery green tint, both reputedly found in the Mainz/Speyer area. See also pp. 245-246 for a detailed discussion of the origins of prunted beakers. See also Erwin Baumgartner and Ingeborg Krueger, Phönix aus Sand und Asche Glas des Mittelalters, Munich, 1988, pp. 210-217.