Hamilton H51616731 American Classic Chrono-Matic 50 Auto Chrono - Limited Edition 48mm x 52mmDistinctive, daring and definitely an attention-grabber, the Chrono-Matic 50 is based on the Chrono-Matic E and limited to 1,972 pieces. Powered by the H-31 automatic movement, at 48 mm, it’s not for the faint hearted. The reverse panda dial is a signature Hamilton style statement. Bold red color accents underscore the dynamism of this multifunctional timekeeper which includes a countdown scale.AMERICAN CLASSICA reflection of Hamilton's American roots, this collection offers versatility in a selection of 'wear anywhere' watches.SELF-WINDINGWrist movements cause the inner rotor to swing, transferring energy to the mainspring, and powering your timepiece.STAINLESS STEEL CASEA highly resistant alloy composed of steel and chromium. It can be worked to resemble a precious metal. It is nearly impervious to rust, tarnish, and corrosion.SAPPHIRE CRYSTALSynthetic sapphire crystal is a tough scratch-resistant material, only diamonds could leave a mark.H-31 CALIBERA powerful automatic chronograph movement featuring an extended 60-hour power reserve.WATER RESISTANCEYour timepiece is resistant up to 10 bar (100m) / 145 psi (328 ft).