Here is what it looked like: Note that 12 size hamilton watches do not fit other 12 size cases. (And the second series watches, 902, 904, 912, 916, 918, and 922, do not fit the same cases as the first series watches such as the 920). Beware if you just buy a movement.

There is a blue screw, the set lever screw, that needs to be loosened to remove the stem. The 910 is a close relative and sells for under $100. Watch for a bridge model 920 with screw down jewel settings.

Also note that odd numbered Hamiltons are hunter case watches (bet you didn't know that).

Many of these have silver dials, which I do not like.