Vintage Spring Loaded Crowns....
The first to be made are for the Angelus 240 cal. They are easy to fit, the Angelus stem simply screws directly into the crown and the stem tube pushes into the watch case (run a 4mm drill through the case)... Other Crowns to follow will be for the Unitas 6497, Cortebert 616 and Molnija...
http://www.vintagewatchparts.co.uk/g...loaded-003.jpg
