It really is totally a personal preference as
@brunik mentioned. I happen to have a 6.75" wrist as well and nearly the exact same watch, but on a strap.
When I started wearing this, I came from wearing a much smaller DeVille, so the thing felt massive initially, but now it feels just right.
Consider, as well, how high the watch will sit on your wrist and if you'll be wearing a watch of this size with tight shirt cuffs or not.
So in the end, to be confident about your choice, you'll probably want to go out of your way to find a boutique or an authorized dealer and try on difference sizes to be sure, but I think 42mm is a great a size for me personally.
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