The limited editions top out the range with a retail price

And then there is the world time function. You'll notice the list of reference cities around the dial. Those are used when selecting different timezones. On the fly, you can easily switch to any of the major timezones without losing accuracy on the watch. Citizen makes it pretty simple to adjust, thus allowing for a great traveler's companion, or timepiece for people who like to easily know the time in lots of other timezones. Remember, the trick here isn't just the functionality - that has been done. But rather the relatively svelte layout and simple dial. The little "SMT" indicator on the dial is for turning on and off day light saving time by the way. The other area is part of the manual sync functions for the atomic clock synchronization. Otherwise the dials are pretty clean, and with the large hand and applied hour numerals (both coated with luminant) this is a very legible, sensible looking high-function timepiece! While each version of the watch is a bit different, they are each in steel cases (some in gold tone), and about 43-44mm wide. Actually, there is one model in a titanium case. The cases are relatively thin, and thankfully all have sapphire crystals. Citizen has offered certain pieces in other countries with sapphire crystals that the US only saw mineral crystal versions of, but the World Perpetual AT watches all have sapphires crystals in the US. The images above show a lot of the range of styles, but not all of them. You can see the different case shapes and styles, along with the various metal bracelets. There are also leather straps available in most collections. In addition to the standard models, there are two limited edition World Perpetual AT watches available. Both in steel (one is gold tone), they come in limited editions of 2,500 pieces each, have really nice crocodile straps with deployment clasps, and come in nicer wood boxes.