Ion plating
A coating process used for watch cases that creates an extremely hard, scratch-resistant surface and protects the case from signs of wear.

Moon phase display
Function that shows the phases and position of the moon by way of a disk that rotates behind a cut-out in the dial.

Multi-frequency radio-controlled clock or watch
A radio-controlled clock or watch that can receive signals from the transmitters JJY40 and JJY60 for Japan and WWVB for the US and Canada in addition to the European transmitter DCF 77.5.