"+0.4s/day after having it adjusted again a few weeks after its service", how on earth do you really measure the accuracy of a watch at 0.4 seconds at day?
I use an app where you tap the screen when you see a given time on your watch, which it then compares to the atomic clock time. This plots the watches accuracy over time and shows you the rate and variance graphs. This is very accurate, particularly over time, and useful to plot the health and performance of a movement.
Over the past 59 days and 17 data points, my Explorer (3132 movement) sat at +0.4spd average, with a nice and straight line, meaning it does not have much positional variance or difference in rate between resting and moving. Previous watches, including another dive watch, the Omega Planet Ocean (2500 Co-Axial movement), had quite a bit of variance and you could clearly pick out night time on the bedside table vs wearing vs vigorous activities.
It is the consistency of time keeping that matters, not how many seconds plus or minus, as this can be regulated. This is where a great movement shows. This, along with the general quality and material finish of the watch, is what I am looking for.
The 3132 has great shock and magnetic resistance, and once properly regulated, it keeps perfect time. I owned it for 7 years before the first service, and only serviced it as a preventative measure, not because time keeping declined.
Why one would wear a Sub for diving?
- It is a dive watch, and if you wear it every day and happen to go diving, just keep wearing it for the fun of it. It is no longer the useful/required accessory it once was, but there is a peculiar fun about wearing a dive watch whilst diving that non-watch enthusiasts may not understand.
- It uses 904L steel, which is corrosion resistant enough not to worry about any salt water damage
- It has a great crown seal (triplock system) with enough gaskets/O-rings to make water intrusion a non-issue, provided they are in good health. A Sub will pass a pressure test well beyond its service interval.
- Modern Subs have a great adjustable bracelet, so it can be sized for a wetsuit without any fuss.
So it just needs to be rinsed like any other dive equipment after a dive and nothing at all will happen.
As for those that cry about the price of these watches, the world of watches can be like that of vintage/collector cars. Or paintings. Or antique violins. If you buy a Fossil or TAG, they will depreciate immediately like an entry level car brand. Unless you buy to love and keep the watch, you are actually the 'idiot' that is losing money - not the guy that spends a well considered $80k on a Patek that he can own and sell for a good profit because that is where the market happens to predictably move. Rolex is not Patek, but for a number of reasons, they have steadily climbed in new and particularly used value, with the current supply of 'professional' (sports) models being so squeezed that I could sell the watch on my wrist above retail to someone who wants it right now, and not be on a wait list for who knows how long to get it. Instant gratification drives used values for a few models here, and the Sub is on that list today. For as long as I bought/sold them when I was still keenly interested in watches, they have been an appreciating asset. I am not saying this is sustainable or will continue, just what it was.
Just don't jump to conclusions about the value of certain watches based on a dollar figure if you don't actually understand that space.