Keystone Watch Co.
Location: Lancaster, Pennsylvania
Years of Operation: 1884-1891
Predecessor: Lancaster Watch Co.
Successor: Hamilton
Originated from the Lancaster Watch Co. and purchased by Hamilton Watch Co., 1891. All lookups should be conducted under the Lancaster Watch Co.
Production Jewels: 7-20 Jewels
Production Sizes: 18s, 8s, 6s
Total Production: ~215,000
Serial Number Lookup
Company Timeline
Predecessor: Lancaster Watch Co.
1884
Keystone Watch Co. begins operations.
1891
Keystone Watch Co. ceases operations.