Courvoisier & Wilcox Mfg. Co. Case Trademark Trademark Manufacturer: Courvoisier & Wilcox Mfg. Co. Manufacturer Years Active: 1883 - 1905 Trademark Markings: 10K C.W. Mfg. Co. [Three Stars] U.S. Assay. Other Courvoisier & Wilcox Mfg. Co. Trademarks