actual: 2.1 cm (13/16 in.)
leaded bronze
6th-5th century BCEEast AsianOpaque black glass
4th-3rd century BCEGreekBronze
6th-4th century BCEGreekCopper alloy
7th-8th centuryAvarCopper alloy
7th-8th centuryAvarBronze
8th-7th century BCEGreekAgate
3rd millennium BCESumerianCopper alloy
8th-7th century BCEItalicIron
19th centuryGermanBrass
4th century CERomanCopper alloy
9th-8th century BCEItalicLeaded bronze
1st century BCE-2nd century CERoman