The Seiko SKX007J is a true tool watch. Why? Well, you can literally drive nails with it and it’ll still keep good time. Day and date complications for very little money. Why DOESNT everyone have one?!?
This is the answer for me. I wear my SKX every day for pretty much everything, besides wrenching, working out and sometimes skiing when my G-Shock(one of the old-school square ones) gets a little wrist time. And that's only because the SKX gets in the way a bit and gets gross if I'm sweating on it and getting oil on it all the time, not because it wouldn't work fine for those activities too. It's the ultimate tool watch because it's versatile, good looking, and tough enough that you never have to worry while being cheap enough that you won't. I'm a bit of a watch nerd myself, but my collection is a little lame consisting of the SKX, the G-Shock and a Seiko SNK(my first mechanical watch). I can't bring myself to spend thousands of bucks on a luxury piece and I have yet to find a watch in the >$500 range that I think would get enough wrist time over the SKX to be worthwile.
But the best “expedition “ watch is probably the Omega Moon Watch. Speedmaster Professional with the hand wind 821 movement (post ‘68) only because there are a billion of them and it’s like a small block Chevy to repair, and fitted with the solid back and plastic crystal. Yes, you have to wind it each day and no, it does not have the date. But it ticks many boxes for durability, reliability, reasonable cost, moderate water resistance (50m I believe) and holds value well if you really get in a jam and need cash. The Rolex trumps here but they can attract the wrong attention too...
Also, I have to disagree on the Speedy. I love Speedies and if I ever decide to buy a luxury watch it's almost definitely going to be a Speedmaster Professional but it has to be the basic square solar/atomic G-Shock like mine for the best actual 'expedition' watch:
It does everything the Speedmaster does, it keeps incredibly good time even if it's not receiving radio syncs(I lived in a concrete apartment building once where it didn't get syncs at night and live too far to get syncs from Colorado during the day. It went a good 4 months without a sync and when I checked it against the official atomic time it wasn't even a full second off. The battery stays charged by solar power and is never a concern, it can apparently fully function for 8 months in total darkness. I've never worried about keeping it in a lit area, don't wear it very much and I've never seen it indicating anything besides full charge. It'll survive literally anything and it costs less than $100. I don't think the value thing is really relevant. In this day and age if you're somewhere that someone could afford to buy the Speedmaster for decent money there is certainly an ATM nearby and that $4,000 could be sitting in your bank account in liquid form instead of on your wrist in illiquid form.
I get the appeal of wearing a mechanical watch over a digital one for intangible reasons, but at the end of the day if we're talking about practical benefits on an expedition they're all here. Also, the non-solar and non-radio version of that watch is Space Filght certified(radio sync and solar charging would be pretty pointless in space..) for the ultimate expedition, just like the Moonwatch.