Hamilton H38425720 American Classic Intra-Matic Auto 40mmWith a striking two-tone dial, the Intra-Matic Automatic has a vintage-infused style that will transition from the office to a weekend getaway without missing a beat. Powered by our exclusive H-10 movement featuring the anti-magnetic alloy Nivachron, this standout 40mm timepiece is precise, reliable and full of character.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.SUPER-LUMINOVA®Super-LumiNova is a type of luminescent material applied to hands, dials and bezels to make them visible in the dark.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-10 CALIBERA three-hand automatic movement boasting a superior power reserve of 80 hours and featuring a Nivachron™ balance spring.WATER RESISTANCEYour timepiece is resistant up to 5 bar (50m) / 73 psi (164 ft).