World time watch with ability to display time in different zones without resetting watch time. Also known as the pan-am watch since it was favoured by airline pilots in the late 70's. This was because of the yellow LCD backing which made it easier to read in low light suroundings. Good provenence and a well balanced display make these watches desirable if the condition is right. Many other makers have tried to copy this model (MBO, Beltime and Seconda to name a few) but none managed to have the look and feel of the Seiko.