| Name | Summary | Parent Co. | Child Co. | Is Base Co. |
|---|---|---|---|---|
| Warren Telechron Company | Henry Warren's second company | Telechron | No | |
| Waterbury Clock | Waterbury Clock Company. The Benedict & Burnham Manufacturing Company of Waterbury, CT was formed in January 1843 to manufacture brass sheeting, brass products and gilt buttons. By the summer of 18 . . . | Timex | Yes | |
| Waterbury Watch | Waterbury Watch Company was organized in 1880 to make inexpensive watches. In 1898 it was renamed New England Watch Company. | Yes | ||
| Webb C. Ball | Watch manufacturers, Cleveland, Ohio. Specialized in railroad watches and clocks. | Yes | ||
| Welch, Spring and Company | Later merged into E. N. Welch Mfg. Co. | Yes | ||
| Westclox | This is the base company for Westclox, including United Clock Co., Western Clock Co., Western Clock Mfg. Co., etc. | Columbia Time Products; Eastern Time Limited; General Time Corporation; General Time Instruments Cor . . . | Yes | |
| Westclox Canada Talley Industries | Westclox Canada, Talley Industries, a division of Talley Canada Inc. | Westclox | No | |
| Westclox Div. General Time Canada | Westclox Division General Time of Canada Limited; Peterborough, Canada. | Westclox | No | |
| Westclox Div. General Time Canada Talley | Westclox Division General Time of Canada Limited, A Talley Industries Company; Peterborough, Canada. | Westclox | No | |
| Westclox Division of General Time Corporation | Starting in 1949 | Westclox | No | |
| Westclox Division of General Time Instruments Corporation | This name used when General Time Instruments Corporation was formed in 1936. | Westclox | No | |
| Western Brass | 1945 advertisement: Western Brass Mills, Division of Olin Industries, Inc. East Alton, Illinois. 1956 advertisement: Western Brass, Western Brass Mills Division, Olin Mathieson Chemical Corporation, E . . . | Yes | ||
| Western Clock Company Ltd. Canada | Western Clock Company, Ltd., Peterborough, Canada | Westclox | No | |
| Western Clock Company (the first one, 1887 - 1888) | Started in 1887. | Westclox | No | |
| Western Clock Company (the second one, 1912 - 1936) | Starting in 1912 | Westclox | No | |
| Western Clock Manufacturing Company | Starting in 1888 | Westclox | No |
