Cartier Tank Americaine 21mm White Dial Stainless Steel Case Two Tone Bracelet

Product Review (submitted on 23 November 2017):

I love it -- it's just the right size for easy reading and the right shape to hide discretely under the sleeve.

That said, you may want to see how it looks on your wrist first. In picture, this is IMHO one of the best looking watches. However, once you wear different Tanks on the wrist, you'll want the Française because that has better proportions between watch body and strap width.