Here's a Table of Contents for all the Horology 101 subject with links to each article. MECHANICAL * the descriptions in this section are based on a typical 18,000 bph movement. Overall Description Jewels - part 1 Jewels - part 2 Balance & Hairspring Accuracy & Beats Per Hour Mainsprings Mainspring Barrels Wheel Train Escapement Automatic Winding System CASE MATERIALS Gold (Yellow & Rose) Gold (White) Platinum Stainless Steel Titanium Gold Plating Alternate Plating Methods OUTER COMPONENTS Crystals Hand Styles QUARTZ PERFORMANCE & CALIBRATION COSC Certificate Wear & Lubrication Positional Error Waterproofing ETA Grades MISCELLANEOUS The 5 Most Influential Automatic Calibers Smoke & Mirrors History of Time Keeping Devices History of Self-Winding Watches