In a recent issue Mitch talked about a few vintage blackened-steel pocket watches in Max Büsser collection.
Simple looking dial with a surprising full triple calendar on back.
Jumping hour on green enamel dial.
This inconspicuous watch belies the fact that it boasts a 7-day power reserve.
You can download a pdf of the article by clicking on the image above or Watchismo's Timewarp - Vintage Watching: Max Büsser