Lucerne Sport, "Calculator". Produced in 1955. Fine and unusual, stainless steel gentleman's wristwatch with round button chronograph, registers, tachometer and calculator with no return to zero of the chronograph hand.
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C. signed R. L. Lapanouse Ltd, three-body, polished, revolving and graduated black and red bezel for the calculator functions, back engraved with a sports car. D. black with radium-coated Arabic numerals, matte silver auxiliary dials for the 6 hours on the 7 and the 45 minutes on the 11, outer telemeter graduation, concentric, 1/5
th second, at the center, spiral tachometric scale. "Bāton" radium-coated hands. M. Cal. 13''', signed Wotag Trading Co. , electronically timed, gilt brass, 1 jewel, pived lever escapement, monometallic balance, self-compensating flat balance-spring. Dial, case and movement signed. Diam. 38 mm.