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From the American Horology Archive:
E. Howard Watch Co. (Keystone)

Grade: Abbott

Private Label(s) in Run:
What is a Private Label?
Manufacturer: E. Howard Watch Co. (Keystone) ?
Manufacturer Location: Waltham, Massachusetts ?
Movement Serial Number: 981473 ?
Grade: Abbott ?
Variation: Abbott Sure Time ?
Model: 1905 ?
Estimated Production Year: 1917 ?
Run Quantity: 1,800 ?
Grade/Model Run: 6 of 7 ?
Grade/Model Total Production: 7,200 ?
Variant Est. Production: 5,300 (16S-M1905-17J-HNP-U-ABBOTT SURE TIME) ?
Size: 16s ?
Jewels: 17j ?
Jewel Material: Ruby ?
Jewel Setting: Raised Gold Settings (Screw-Set) ?
Movement Configuration: Hunting ?
Movement Finish: Nickel ?
Finish Pattern: Circular ?
Movement Setting: Pendant ?
Plate: 3/4 Plate ?
Double Roller: Yes ?
Regulator: Reed ?
Hairspring: Breguet ?
Standard Dial Type: Double-Sunk ?
Adjusted: Yes ?
Railroad Grade: No ?
Dial Feet Locations: 10.7, 24.3, 48.9 ?
Movement Markings: Abbott Watch Co. Adjusted 17 Jewels Pat'd '05 ?
Case: Various ?
Run ID: 127.G6.16S101.161905M88.H46.P105.17J93 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 34 (1.89%) ?
Research Note: #981497: Reported as Lever-Set. #980974: Reported with Checkerboard Pattern. All of run appears to be marked for "Abbott Watch Co." with various dials.