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Item#TypeModel No.Model NameMakerCountryMaterialDiameterDateCondition
CHT001Pocket
Type 3 Thin
CalculigrapheHenri ChatelainFranceNickel-plated brass"2-1/8"c. 1878-1894
C5

Notes: "Thin"" version - 5/8"" (16mm) thick. Has oval chain loop and short knob. Same scales as Boucher's Calculator. Knob rotates front scale and turns cursors front and back when side button is pressed. H.C. with opisometer logo. No Made in France."

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