One of the crafts associated with dial decoration is the handmade guilloche on rose engines which I appreciate a lot.
Not to be confused with stamped or laser engraved guilloche with is only decoration and no art.
The work is mostly done on century old machines by incredibly skilled people.
It takes many years to learn the art of creating guilloche and in today's world there are not too many of these artists still at work.
Add to this that it can take 1-2 days of intensive work to create just one complex dial and you get a good sense of the rarity of these dials.
Not to mention that one little mistake ...and the whole work is lost !
I have been lucky to accumulate a few of these watches in my collection.
There is of course Breguet being famous for its guilloche dials although latety (probably because of capacity limitation) some of their work has become a bit more simple.

Not sure if A&S does its guilloche work in-house : the result is however striking.

The one big name in the world of guilloche is of course Jochen Benzinger.
Here we see a couple of his watches.

From a pure artistic point of view,the work on the GAP 1 is probably the most sophisticatic that I have seen sofar.

Torsti Laine is relying on a Swiss manufacture to create the beautiful guilloche patterns.

And this superb moirée pattern on the GOS is again the work of Jochen Benzinger.
Thanks for looking,
Gerard