Anyone know? And why is it that watch companies rarely publish this on the "details" part of their watch listings?
I'm not sure what "new tresor" means specifically (why is it that people don't give a model number when they ask these questions) but if you are referring to the one that came up when I had to Google to answer this, so a 43253402109001, then it's 20 mm.
Thanks. As to your second question, I can give you a definitive response: Because a certain person did not plan his morning well, was rushing out the door, could not find the answer after a cursory Google search, and hoped he would get an answer from an owner, who would know the measurement off the top of his head, and not need to do more to find out than I would have, had I had more time. Apologies.