Some of the topics covered in the caliber listing:
What is the difference between caliber 6497-1 and 6497-2?
There are two variations of the ETA/Unitas 6497 including the 6497-1 and 6497-2. While they are both the same size, have 17 jewels, and a small seconds subdial at 9:00, there are two main differences that are important to keep in mind when choosing your 6497 powered watch…
The big difference between the two 6497 variants is that -1 beats at 18,800vph while the -2 beats at 21,600vph. The -2 can be found in watches like Panerai and typically costs more.
Another lesser known difference between the 6497-1 and 6497-2 is that the -1 has a power reserve of about 44 hours and the -2 has a power reserve of about 53 hours.
The -2 can be found in watches like Panerai and typically costs more.