A Hamilton model 22 marine chronometer. It has been cleaned up and oiled, and it winds and sets smoothly and is running accurately. A few of the parts had some surface corrosion on them, and they have been re-polished. The mainspring is getting a little bit weak, but it still is strong enough to run it pretty well. Dial and hands are in great shape, damaskeening is in good shape overall. All jewels are intact. Crystal has some minor wear. Very clean example of this historic timepiece! :)