@tanguatlay,
The sentence is okay, although I prefer "even including" to "including even"
1. Chronometer watches and clocks are considered to be more accurate than the other mechanical watches and clocks, even including quartz watches and clocks.
You can even leave "even" out completely:
2.Chronometer watches and clocks are considered to be more accurate than the other mechanical watches and clocks, including quartz watches and clocks.
"Including" and "as well as" are close enough in function to be interchangeable.