Is the Mathy a good dress watch?

Yes. The 7.5mm case is thin enough to sit under a shirt cuff, and the sunray dial with date looks clean with formal wear. It is a quartz watch, so it is accurate and needs only a battery change.

How does it compare with mechanical watches at the same level?

It trades mechanical charm for thinness and low upkeep. You get sapphire and a slim steel case, but a push-pull crown and quartz movement rather than an automatic.

It is rated to 50 meters, which covers splashes, rain and brief handwashing. Do not swim or dive with it, and the push-pull crown should stay pressed in around water.

What size wrists does the 42mm case fit?

The 42mm case and 7in bracelet suit most average to larger wrists. Slimmer wrists may find the case wide and need links removed or a strap swap.

Does the bracelet take other straps?

Yes. It uses a 20mm lug width, so most 20mm straps will fit. That makes it easy to switch from the steel bracelet to leather.

The watch on its stainless steel bracelet, with the manufacturer's limited warranty. Presentation varies by seller, so check what is included before ordering.