bimetallic: nickel brass centre in copper-aluminium-nickel ring (core: 70% copper, 15% nickel, 15% zinc. ring: 92% copper, 6% aluminum, 2% nickel)

Prägungen aus bimetallic: nickel brass centre in copper-aluminium-nickel ring (core: 70% copper, 15% nickel, 15% zinc. ring: 92% copper, 6% aluminum, 2% nickel) und anderen edlen Legierungen.