A Stainless Steel Ref. 01.0500 El Primero Wristwatch, Zenith, Circa 2001, purchased in January of 2001, 38.50 mm case diameter, matte finish black dial signed ZENITH, luminous Arabic numerals with outer tachometer calibrated to 400 units, guilloche subdials at 3, 6 and 9 o'clock for chronograph minutes, chronograph hours and seconds respectively, date aperture between 4 and 5 o'clock, luminous index hands with center sweep chronograph seconds hand, polished circular case, brushed concave lugs, chronograph pushers at 2 and 4 o'clock in the outer band, snap on exhibition case back with sapphire crystal, Cal. 400Z El Primero self-winding 31 jewel rhodium plated movement signed ZENITH, brown crocodile strap, steel tang buckle with maker's mark.Accompanied by an inner case, outer box, books and hang tag, all signed ZENITH.