The list of 'I' refiners/mints/hallmarks:

• ICI
• International Silver Ltd. Inc
• International Coin Museum
• International Vaults Refining (to do)
• IPM/International Precious Metals (oval logo + ipm)
• IPM/Intermountain Precious Metals (ipm logo) (to do)
• Irrawaddy Counting House (to do)
• IRSCO