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Folding Douk-Douk knife giant, overall length 260 mm, closed length 142 mm, weight 146 g, carbon steel blade XC75. Marking blade electrical and chemical process. Handle coated gunmetal. Wood pencil case. The douk-douk is a French pocketknife of simple sheet-metal construction. It has been manufactured by the M. C. Cognet cutlery firm in Thiers, France, since 1929.