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From the American Horology Archive:
ball-waltham

Grade: Official Standard

Manufacturer: Ball - Waltham ?
Movement Serial Number: B230580 ?
Grade: Official Standard ?
Model: 1899 ?
Estimated Production Year: 1908 ?
Run Quantity: 300 ?
Grade/Model Run: 58 of 107 ?
Grade/Model Total Production: 71,861 ?
Variant Est. Production: 19,000 (16S-M1899-21J-O-L) ?
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 [Plugged] Jewels Adjusted 5 Positions Sapphire Pallets Trade Mark Pat.Nov.17.96 ?
Case: Various ?
Database Version: v52.978 ?
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Research Note: #B230708: 21j (Plugged); Corresponds to Waltham Serial run starting with #15,230,001