Technical Information and FAQ
Hamilton Balance Staffs, New and Old Part Numbers Staff numbers, watches size and description
Hamilton Balance Staffs - Technical Data (T. D. 111)
Elgin Hands, 18 and 17 Size, for Key-Set Watches
Elgin Hands, 18 Size, for Stem-Set Watches
Elgin Hands, 16 Size Watches
Elgin Hands, 14 Size Watches
Elgin Production History for 3-Fingered Bridge Movements
Until 1915. Elgin publish model and class information about is movements. Later products were designated by grade only. There's some more information about this here...
This catalog for retail dealers includes Elgin watch prices, models and other information
Information for Elgin retailers, mid-1950s
These are numbers The Elgin National Watch Company used for types of watch parts. They appear on parts packaging along with the specific factory numbers.
Look up and identify American balance staffs
Identify unknown balance staffs by their dimensions