I just finished restoring one of the thin-model 12-size Hampdens and thought I would share a couple of unusual quirks of this watch so that anyone else getting into them does not go too far astray. This model includes the Nathan Hale (15j), Minute Man (17j) and Paul Revere (17j & 19j).

Winding and Setting - has a positive setting mechanism with a detent screw you must back out to release the stem. At the lower end of the winding arbor is a loose steel bushing that you could lose when you take the watch apart unless you watch out for it. There is a tension spring for the winding/setting clutch that is buried inside the barrel bridge; you must pull this back (accessed through the top of the plate) to allow the plate to settle in when reassembling the watch. Otherwise this spring will bind against the side of the clutch.

Balance staff - this watch takes a friction staff and has a double roller. The safety roller is driven onto the lower end of the staff, as you might expect. The roller table is integral with the balance wheel and cannot be removed. The friction staff is driven out with the roller table still attached to the balance wheel and you will need a stump or stake that is cut out to clear the roller jewel. The last person to work on this watch tried VERY hard to remove the roller table and destroyed the balance wheel.