10 000 Riels - Norodom Sihamoni Colosseum of Italy

Cambodia has issued commemorative bimetallic pieces tied to international landmarks since the early 2000s, part of a broader collector-market strategy common among smaller issuing authorities seeking hard currency revenue. This piece was struck under Norodom Sihamoni, who ascended the throne in October 2004 following his father Sihanouk's abdication — making him a relatively new head of state at time of issue. The gold centre is a genuine .999 insert, not plating, which distinguishes this type from cheaper bimetallic commemoratives flooding the same market segment in that decade.