I spotted something unusual on eBay, two examples of a Mosler 168 hour backwind timelock. These appear odd, first because 168 hours is pretty long (that's 7 days). Second, the dial apparently rotates well past one full turn; there are tiny windows which read 0, 10, 20, 30, and 40; I presume these change to 30, 40, 50, 60, 70(?) after the first rotation. I've not seen this before.

I'm guessing "1120" is the model number.

Backwind -- is this a feature that allows you to back up if you wind it too far?