Chemical Composition: ICP-MS/AAA data from sample, Mixed Copper Alloy:
Cu, 73.99; Sn, 5.88; Pb, 10.39; Zn, 9.04; Fe, 0.2; Ni, 0.04; Ag, 0.11; Sb, 0.16; As, 0.15; Bi, 0.032; Co, less than 0.01; Au, less than 0.02; Cd, less than 0.002
Technical Observations: The patina is dark green with light gray accretions. Metal shows through where the patina is worn away. This is the right half of the lock and is intact; the left half and the locking mechanism are lost. There are many dents and areas worn from use. Some scrape marks on the surface appear more recent and are probably the result of a crude cleaning procedure.
This half was probably lost-wax cast, but sand casting is also possible. The two halves of the lock would have been separately cast, joined together, and then finished as a unit. Lead residue covers the join surface. Relief features, such as the notches in the horns, were cut in the metal with an abrasive tool.
Henry Lie (submitted 2005)