1906 BARBER DIME (MINT MARK O) VALUE: 10 cents Mass: 2.500g DIAMETER: 19.91mm (0.705in) EDGE: Reeded COMPOSITION: 90% silver, 10% copper YEARS OF MINTING: 1892-1916 MINT MARK: O located on reverse beneath wreath OBVERSE DESIGN: Head of Liberty DESIGNER: Charles E. Barber 1892 REVERSE DESIGN: Denomination within wreath DESIGNER: Charles E. Barber 1892