Reference Library

• Introduction
• How To Lookup a Watch
• How To Open a Watch Case
• Intro to Pocket Watch Cases
• Watch Sizes
• Movement Setting Types
• Movement Configurations
• Movement Plate Types
• Movement Finishes
• Jewel Counts
• Jewel Settings
• Hands
• Deeper Topics
• Watch Parts Labelled
• Adjustments
• Single vs. Double Roller
• Regulators
• Mainspring Barrel Types
• Safety Pinions
• Railroad Grade Classifications
• Utilities
• Crystal Size Chart
• Watch Key Sizes
• Dial Feet Locations
• Trade Names
• Private Labels
• Watch Factory Map
• Case Trademarks
• Collecting & Research
• Problems & Repair
• Mainsprings
• Balance Staffs
• Watch Part Suppliers
• Catalogs & Publications
• Wholesalers & Retailers
• Abbreviations & Lettermarks
• Buying Guide
• Watch Showcase
• Trending Watches
• Recommended Books
• FAQ

Constant Pocket Watch

Constant was used as a trade name on pocket watch movements manufactured for Mermod, Jaccard & Co. by .