CALCULIGRAPHE, French circular slide rule, c1880, similar in form to a pocket watch (53mm), nickel case with open faces, white metal dials both sides, with sweep hands, fixed cursor on back dial at 12 o'clock, winding top with separate push button, ring top suspension. Not in working order.
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CALCULIGRAPHE, French circular slide rule, c1880, similar in form to a pocket watch (53mm), nickel ...