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From the American Horology Archive:
Ball Watch Co.

Grade: Official Standard

Manufacturer: Ball Watch Co. ?
Manufacturer Location: Cleveland, Ohio ?
Movement Serial Number: B266561 ?
Grade: Official Standard ?
Model: 1899 ?
Estimated Production Year: 1919 ?
Size: 16s ?
Jewels: 21j ?
Jewel Setting: Gold Settings (Screw-Set) ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Finish Pattern: Circular ?
Movement Setting: Lever ?
Plate: 3/4 Plate ?
Regulator: Reed ?
Hairspring: Breguet ?
Adjusted: Yes ?
Adjusted to Position: Yes ?
Adjusted # of Positions: 5 ?
Adjusted to Temperature: Yes ?
Adjusted to Isochronism: Yes ?
Railroad Grade: Yes ?
Movement Markings: Official RR Standard Ball Watch Co. Cleveland, O. 21 Jewels Adjusted 5 Positions Sapphire Pallets Trade Mark Pat.Nov.17.96 ?
Case: Various ?
Database Version: v52.978 ?
Research Note: #B266241, #B267772: 21j; Corresponds to Waltham Serial run starting with #23,265,901