RAD2Copied from the comment a few scrolls down:
The Asian counterparts of the U.S. Nighthawk come without the "Nighthawk" text on the dial. They also have partly lumed metal indices which help give the dial a classy look. In addition, the "12" and "6" numbers aren't raised like the U.S. versions.
What makes these Nighthawks interesting is the wonderful engraved caseback.
More info on various models here -
https://forums.watchuseek.com/f281/collectors-guide-all-different-citizen-nighthawk-variants-253986.html