Speaking of that Ham 910, the database has this note at the top: "Only Sold Already Cased by Hamilton."

But this watch is in a Montauk 20-yr swing-out case w/o any other case marks. Does this mostly likely mean A) it was recased at some point by a jeweler or watchmaker into an unused swing-out case? or B) there are exceptions to the Database "rule."

I see that others on eBay are in Hamilton-marked cases, so I favor the former, however odd it may be to consider recasing into a swing-out, which Hamilton did use, if not often.

Whatever the case, that watch is a good runner.
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Apologies. Here is the info given:

Grade: 910
Only Sold Already Cased by Hamilton.

Movement Serial Number: 1790540
Estimated Production Year: 1914
Run Quantity: 25000
Size: 12s
Jewels: 17j
Movement Configuration: Openface
Movement Finish: Nickel
Model: 1
Movement Setting: Pendant
Plate: 3/4 Plate
Adjusted: Yes
Adjusted to Positions: Unknown
Railroad Grade: No
Notes: Pillar Plate Diameter: 1.630"

Do any members here have a Hamilton 910 that is in a case w/o extra case marks, but not in a Hamilton case?