This high quality mechanical pocket watch features a shock protected 17 jewel wind up mechanical movement. Like all mechanical pocket watches, it must be wound daily to keep time. Unlike a quartz watch, a mechanical pocket watch never needs a battery! Instead of using the standard high grade movement used by the other brands, Desperado has chosen to use the BEST mechanical movement maker outside the borders of Switzerland for this flagship model! The extra cost of the Sea-Gull movement is evident when comparing side by side with other watches in its class. In many cases, the competing watches with less expensive movements cost several dollars (even hundreds) more! We HIGHLY recommend this watch! This beauty features an ultra high grade 17 Jewel mechanical movement. The wind up "3-Finger bridge" movement is skeletonized and also features blued screws. This intricate and highly detailed movement is visible through the dial as well as a mineral glass crystal on the back of the case. The 51 mm case is the size of many of the antique "16s" size pocket watches from Elgin, Hamilton, Illinois and Waltham. Specifics: Model "Golden Gate" About 2 inches wide (approx 51 mm) About 2 3/4 inches tall (about 72 mm) About 1/2 inch thick (about 14 mm) Raised Polished Silver Roman Numerals Classic Blue Spade Hands with Seconds Sub Chapter Chrome Plated Display Back Case Scratch Resistant Glass Crystals Premium Shock Resistant High Quality 17 Jewel "Swiss type" Skeletonized Mechanical 3-Finger Bridge "Sea-Gull" Movement Includes: Presentation Gift Box Factory Paperwork Chrome Plated Chain As an authorized Desperado internet retailer, all Desperado pocket watches we sell carry a 2 year manufacturer warranty!