The ISA caliber 8173A is a 9 jewel quartz movement, classified as a multi-function movement by ISA. It encompasses several features including hour and minute hands, a small seconds subdial positioned at 2 o'clock, a date window at 4 o'clock, a central GMT hand serving as a 24-hour indicator, a day subdial located at 6 o'clock, and an alarm and battery power reserve subdial positioned at 10 o'clock.