1911 BTR Perpetual Chronograph.Ebel, 1911 BTR Perpetual Calendar Chronograph, No. 12/20, movement No. 00277, case No. A107917.Ref. E9288L70. Made in a limited edition of 20 examples circa 2006..Fine and rare, hexagonal, self-winding, water-resistant, stai
C. Three-body, polished and brushed, inclined bezel with 5 screws, concave lugs, transparent case back with 8 screws, screweddown.octagonal winding-crown, sapphire crystals. D. Black with applied luminous steel baton indexes, subsidiary dials for.the seconds, 12-hour and 30-minute registers, the days of the month, of the week, the months and the leap year, outer.1/5th seconds and minute division, outermost tachometer scale, aperture for the moon phases. Luminous steel baton hands..M. Cal. E 288, rhodium-plated, fausses cotes and oeil de perdrix decoration, 27 jewels, straight line lever escapement, monometallic.balance, shock absorber, self-compensating flat balance spring..Dial, case and movement signed..Diam. 44.5 mm. Thickness. 14.5 mm.