Pocket Watch Database

We noticed that you entered a relatively short serial number.
"685" could possibly indicate the grade of the watch and not the serial number of your movement. Serial numbers are usually more than a few digits.
From the American Horology Archive:

Osaka Watch Co.

Grade: Osaka

Manufacturer: Osaka Watch Co.
Manufacturer Location: Osaka, Japan
Movement Serial Number: 685
Grade: Osaka
Model: 1
Estimated Production Year: 1896
Run Quantity: 10
Grade/Model Run: 1 of 3
Grade/Model Total Production: 30
Size: 18s
Jewels: 11j
Jewel Setting: Burnished Jewels
Movement Configuration: Hunting
Movement Finish: Gilt
Movement Setting: Lever
Plate: Full Plate
Regulator: Plain
Hairspring: Flat
Railroad Grade: No
Movement Markings: T
Osaka Watch Co.
Osaka Japan
Safety Pinion
Case: Various
Run ID: 1.G1.18S1.181M1.H1.L1.11J1
Database Version: v52.249
Advanced Metrics
PWDB Absolute Rarity Index:
Scoped for Grade/Size/Model/Configuration
0.09
PWDB Relative Rarity Index:
Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration
100.00
Share of Production:
Share within Manufacturer - Scoped for Grade/Size/Model/Configuration
60.000%
Registry Population: 1 (10.00%)

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