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

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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