You can look into the Baltic Aquascaphe. No saphire caseback (you won't find much on divers anyway, especially with this price range) and the bezel is saphire not ceramic.
There is a Seiko which could work too, the SPB053 (or 051 if you prefer black). Bezel is not ceramic but aluminum with tungsten coating I believe.
You can also check Christopher Wards, Steinhart (quality is unbeatable for the price, but they are Rolex design rip off).
If you can go up to 2000$ you can also go for a Seamaster pro 300 used, the regular blue one or the sword hands version (called Peter Blake).
If you can add a few more bucks you could have the "old" ceramic Seamaster pro.