Vintage Alpine Pocket Watch CWC Co Crescent Case Sterling Silver Open Face Swiss. This is a sterling sterling silver open face sterling silver pocket watch. The watch is a Swiss movment Alpine and has a pink and white face, a minute, hour and second hand. The case is sterling silver, measures 35 mm in diameter hallmarked and signed C. Co with star and crescent moon Trade Mark Sterling 5975. The watch winds correctly and runs, but keeps time slowly.