I want to buy something for my birthday later in the month, and want to try and tick as many of the following boxes as possible;

* 100m or better water resistance
* Chronograph
* Precious metal
* Any other complication

Budget is £5-10k, secondhand.

I'm aware I'm not likely to find anything decent that matches all four criteria. A few that are on my radar that match 3/4

* Breitling H19350 (no wr)
* Rolex daydate (no chronograph)
* IWC GST perpetual or rattrapante (not pm)

Any other suggestions?