pedro765 Collection / Serial #501029 Columbus Watch Co. Grade Ruby Serial #501029 Movement Image Dial Image Case Image Manufacturer Columbus Watch Co. Grade Ruby Serial Number 501029 Size 16s Model 1 Jewel Count 21 Setting Lever Finish Two-Tone Case Material Gold Filled Case Manufacturer Dueber Watch Case Mfg. Co. Case Grade/Model Special Case Serial # 6245874 Dial Material Glassenamel Dial Type Singlesunk Dial Style Roman Dial Signing Name Columbus Watch Co.