The watch comes equipped with a Swiss quartz ISA 8172-220 chronograph movement. The center second hand is used with the chronograph function and remains stationed at 12:00 when not in the chronograph mode. The sub dial at 1:00 displays the seconds. The sub dial at 6:00 has a nice day pointer complication that changes days at midnight and the dial at 10:00 is used to display minutes when in the chronograph mode. The watch has a 30 minute chronograph function. One feature I discovered that I enjoy is the resetting of the main second hand. Unlike many other movements that “snap” the chronograph second counter back in place, the ISA 8172 allows the second hand to “slowly” reset to its stationary position.
ISA initially made mostly bottom end quartz modules; read no jewels and cost $1.00 to replace. From what I’ve read; around 2006; they reorganized; stopped mass producing cheap quartz modules and began making higher end chrono and multi function modules. The few reviews I’ve seen all suggest these newer modules with chronograph complications are pretty good.
The ISA movement in question is a decent movement. Date @ 4 , day @ 6, 30 min chrono @ 10 , 3 jewels. I’m not a big fan of ISA per say , but as far as this one goes its not bad. Wholesale price on a replacement is about $35-$40.
This photo is the same movement above but with the plastic movement holder. This is also what holds the chronograph pushers.