EBERHARD SINGLE BUTTON CHRONOGRAPH STEEL Eberhard, case No.36207. Made in the 1940s. Fine and rare, manual-winding, stainless steel wristwatch with single button chronograph, tachometer and telemeter. Three-body, polished and brushed, curved lugs, inclined bezel, screw-down case back, oval single chronograph button. SatinÈ silver with painted Arabic numerals, outer 1/5th seconds track and telemeter scale, concentric red spiral tachometer graduations, subsidiary seconds and 30-minute registers. Blued steel Breguet hands. Cal. 13''', rhodium-plated, 17 jewels, straightline lever escapement, monometallic balance with screws, self-compensating flat balance spring, index regulator.