I recently had the opportunity to try a friends (read : fellow watch geek) Canon M6 with Canon EF-M 28mm f/3.5 Macro IS STM, that he bought just for watches. I had not realized this when I had the camera (he left it at a bar!), and coming from the bigger camera perspective I thought it was just another dinky little el-cheapo point and shoot.
Until I tried it out that is...
The picture quality is fantastic, and the macro lens is superb. It has a 1.2x magnification when you flip a switch to 'super macro mode' or whatever its called.
Given, the previous 2 are crops, but it really gets in there.
Its also is a great non-macro lens.
It too has a built-in ringlight...
It made me stop and evaluate the current camera situation. IMHO, mirrorless has got a lot of + points going for it above DSLR, and even though I am happy with my 8 year old Canon 6D, I most likely will upgrade at some point to something like the EOS R, or its successor, as I have a lot of good glass that I do not want to replace.
If I wanted to spend under $1k for a camera and lens just for watches, this combo would be on the top of my list.
PS: while I don't particularly like this guy, he does make some salient points.
https://kenrockwell.com/tech/mirrorless-vs-dslr.htm