Since the advent of long-distance plane travel and the GMT-Master in the mid-1950s, the ability to track additional time zones has remained one of horology’s most popular and practical complications. Today, watch lovers have available to them numerous options for such a purpose, including mechanical, digital CBP (Cheap Black Plastic), and smart watches. Rather than focus on any of those, Casio has leveraged the fact that most of us own smart phones to develop the Edifice EQB-600, a Bluetooth-connected device aimed at time zone-hopping frequent flyers.
The Casio Edifice EQB-600 uses Bluetooth to tether to an iPhone or Android-based phone to set and track the two time zones available on the face of the watch. Smart phones maintain time by using their networks to access time servers positioned around the world. The EQB-600D uses this to sync time with a smartphone, which happens four times a day. The main handset references the home time, and the 12-hour sub dial between seven and eight shows the world time, the second time zone.
But before we get into the technical side of things, let’s get some specs out of the way. The EQB-600 is a big watch measuring 47.3mm wide, 13.3mm thick and 52mm lug-to-lug. Though on the larger side, one could imagine that if it were any smaller the sub-dials and surface visuals would be too small to be useful. As I wrote above, the molded dial features a sub-dial displaying an additional time zone via a 12-hour track, as well as a half-circle day-of-the-week display, a date window and a 3D globe dial (more on this one later). The case has a screw-down crown (boasting 100 meters of water resistance) and three pushers for engaging the different functions. The watch is solar powered and good through five months on a full charge, and the calendar is fully automatic through 2099. Accuracy is rated at ±15 seconds per month.