Sapphire Crystal Glass
A power reserve indicates the power remaining within the mechanical movement of a watch, from fully wound to when it comes to a stop. A power reserve of 38 hours, for example, will continue to tell the time for 32 hours before stopping.A power reserve indicator showing the amount of time remaining is sometimes shown as a sub-dial on the main dial of the watch.
Push-button Deployment Clasp
Fold-over Push Button
An open or transparent caseback features on the reverse of a watch and allows the wearer to see intricate details of the mechanism. It is a chance for the watch brand to show off the movement, which can often be decorated for added effect. A transparent caseback can be fully open, have a skeletonised window or cut-out shape.