Id like to start by saying to me thin is the key with dress watches. If it catches your cuff its annoying as hell. A lot have been covered but heres a few ive had over the years and a couple i want to get. Also as a warning i bloody love a tourbillon...
A.lange sohne
Pretty much the king of dress watches. Cant remember a single watch in the ad i wouldn’t of worn with a suit. But they are extremely complicated so the good reps, worth buying are few and far between. The mkf here is great value.
https://www.intime04.co/a-lange-soh...rkers-sec6-on-black-leather-strap-a74789.html
If you like them more complicated the tourbillon is a great rep but hard to get these days.
Ap
Cant say i think ap are really dress watches but they’re bloody good looking! Got to get them on the bracelet though, it makes the watch for me. Had the tourbillon at one point but its fairly close to a royal oak offshore in thickness so i had to get rid of it.
Breguet
As has been mentioned the 7057 is a sexy little thing. I had this tourbillon before, like the unique dial layout. There has also been a few recent releases by mkf on puretime that look to be a bit thinner (9mm) which could be worth considering
https://puretimewatch.io/classique-...al-on-brown-leather-strap-miyota-9015-v2.html
Jlc
Jlc make a few nice dress watches. The master series with seconds at 6 as below is a nice choice. Also as has been mentioned the real moonphase is a great rep in terms of real function.
Patek phillipe
Cant go wrong with a patek. The caltrava is great for the purists, very simple. For something a bit different see below. I like the nautilus on a leather strap, nice and thin. I also have the 5071 below, really nice watch with a great looking movement but depends if you can live with a chrono and a few extra mm in thickness, but it does wear well.
Roger dubuis
I love roger dubuis. If you ever get a chance to go to an ad i highly recommend it. Some of the newer pieces are a bit strange but the Excalibur is my grail so i would be a bit biased. The single tourbillon by bbr is a great rep:
https://puretimewatch.io/excalibur-...-on-brown-leather-strap-a2136-tourbillon.html
At only 10mm its the thinnest rep tourbillon ive seen and wears great with a suit.
If you’ve got the money and dont mind the thickness, first ever rep double tourbillon. Pretty cool.
https://puretimewatch.io/watch-bran...-white-dial-on-black-croco-leather-strap.html
Vacheron constantine
Again cant go far wrong with a vacheron constantine. The top one is very similar to the patek 5071 mentioned above. Middle is a new patrimony which is nice and thin. Bottom is a £250k gen i tried at the ad which is gorgeous!
I guess it comes down to what you like. But definitely try to keep it thin if you can. Hope this is useful!