Denomination detail from a proof $100,000 Certificate of Indebtedness (CI). Series dates range from the 1920s to 1950s. Denominations (in proof format) included: $100 $500 $1,000 $5,000 $10,000 $100,000 (possibly $500,000) $1,000,000 $100,000,000 and $500,000,000.