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From the American Horology Archive:
Hamilton Grade 992 Pocket Watch
Hamilton Grade 992 Pocket Watch
Hamilton Watch Co.
Grade: 992
Manufacturer: Hamilton
Manufacturer Location: Lancaster, Pennsylvania
Movement Serial Number: 2494097
Grade: 992
Model: 2
Estimated Production Year: 1928
Run Quantity: 12,000
Grade/Model Run: 163 of 175
Grade/Model Total Production: 447,200
Size: 16s
Jewels: 21j
Jewel Material: Ruby & Sapphire
Jewel Setting: Gold Settings (Screw-Set)
Movement Configuration: Openface
Movement Finish: Nickel
Finish Pattern: 2nd Pattern (bar)
Movement Signing Style: Serif Caps
Movement Inlay Color: Gilt
Movement Setting: Lever
Plate: 3/4 Plate
Double Roller: Yes
Barrel: Going
Center Wheel Material: Gold
Regulator: Reed
Hairspring: Breguet
Pallet Jewel Material: Sapphire
Standard Dial Type: Double-Sunk
Adjusted: Yes
Adjusted to Position: Yes
Adjusted # of Positions: 5
Adjusted to Temperature: Yes
Adjusted to Isochronism: Yes
Adjustment Tolerance: DUvDD: +/- 6 sec.; 5Pv: +/- 10 sec.; Total Average: +3-6 sec. per day; Temperature: +/- 6 Seconds
Railroad Grade: Yes
Dial Feet Locations: 22.3, 38.0, 57.1
Hamilton 16s Dial Feet Research
Movement Markings: Hamilton Watch Co.
Lancaster, Pa.
21 Jewels
992
Adjusted 5 Positions
Double Roller



The Hamilton Grade 992 16s 21j 10K Gold Filled Keystone Case Pocket Watch from 1928 is a vintage timepiece with a classic design. Featuring a mechanical hand-winding movement with 21 jewels, this open face pocket watch has Arabic numeral indices and a white dial. The 10k gold filled case with a screwback caseback adds a touch of luxury to this American-made watch, perfect for collectors and enthusiasts of vintage timepieces. With its railroad grade style and unique features like a multi-dial and seconds hand, this Hamilton pocket watch is a timeless piece of jewelry.

works missing plastic cover cheap replacement 10k gold filled. dont hold me to it but I think its 1928 not sure