Most useful complication...for you...

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I would say having a chronograph function is most important to me, but I don't always need to time things to the second - so I at least want a timing bezel if not a chronograph on most of my watches. Date is the next most important.

However, while my wife is out of the country right now, I pulled out my Rolex GMT, wound it, and set the 24 hour hand to my wife's time zone and the 12 hour hand to mine. When she is back in 8 days I'll end up going back to my Speedmaster or my Planet Ocean 9300 again, and put this away. I'm lazy and it was easier to do this once than do the math each time I looked at my watch for the next 9 days. Plus, I was heading to the Rolex AD in Denver to pick up the link I ordered for the GMT in December. It's a 12-36 month wait for a new watch, but only a 3 month wait for a LINK!
 
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For me, it's anything with a GMT or quick-set hour hand, as I travel a fair amount for work.

Here are two of my favorites in rotation, and a dream variant if VC ever decides to produce it...

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Here are two of my favorites in rotation, and a dream variant if VC ever decides to produce it...

What is that?
 
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Chronograph is really handy for general timing tasks. I do use the iPhone for that as well, but it’s often more convenient to click the button on my Speedie. Another one is the hacking complication (not on Speedie) to make time setting easier.
 
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Chronograph for me! To time cooking, wait times, gambling sessions... everything 😀
 
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Since you asked… 👍

I've flipped past the 'real' version of that watch a million times; this version, though, has me glad i'm not wearing sweatpants to junior high during puberty
 
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I've flipped past the 'real' version of that watch a million times; this version, though, has me glad i'm not wearing sweatpants to junior high during puberty
Hear, hear!!!

What do you think of this:

Introducing: The Vacheron Constantin Overseas Dual Time With A Black Dial ??
https://www.hodinkee.com/articles/the-vacheron-constantin-overseas-dual-time-with-black-dial. 🥰

I initially dismissed it due to the take on the GMT with AM and PM indicator... but in fact, it is much more intuitive than the 24 hour bezel. 👍
 
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Hear, hear!!!

What do you think of this:

Sweet watch, and like that it comes with the bracelet, rubber, and alligator straps (looks great on rubber).

BUT: a 12 hour slave “dual time” hand on the central dial is weird (it’d be better with a 12 hour sub-dial like the RO dual time); a four position crown may be irritating; but more fatally, it’s prominent dumb-date sub-dial that can only account for months with 31 days (so you will have to make manual corrections to the date five times a year).

For the price and functionality, I’d take the black dial SkyDweller all day (but understand not everyone hangs with a fluted bezel).
 
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Chronograph, very useful for timing office visits at a glance without the patient knowing I'm timing the visit.
 
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Chronograph when using it for timing, and I use it as a date function...two in one!
 
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Changing my vote to day/date. Never had trouble keeping track of the days before but lately I have been finding it a bit more useful.
 
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Changing my vote to day/date. Never had trouble keeping track of the days before but lately I have been finding it a bit more useful.

People hate on the day complication but I work days somedays, nights somedays and often I leave for work and don't return home for a few days while working 20 hours straight then a four hour power nap into another 10 or 20 hours. I often can't keep track of what day it is.
 
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I’ll second @Deafboy here and say my Cricket is number one! Partly because I can set reminders but also it’s probably my most enjoyed complication.

Just behind that would be a GMT.
 
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Chronograph for obvious reasons...

But I also love to use Doxa 1200T´s bezel when diving 😀
It is nice to remember what the original Doxa 300T was built for...
 
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The complications that I find most useful are Date and then power reserve.
I am a fan of digital/direct read watches as well.
I like the look of Chronos and moon phases but I do not have much use for them.
 
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I use the diving bezel to time stuff, especially in the kitchen. For some I don't like using a chronograph to time things like cooking rice etc., perhaps because such things are usually not really dependent on second-perfect accuracy?

Also, a date function is very useful, even if I usually prefer a dial without a date to a dial with one.

Oh, and I used to think that a GMT function would be very useful as I travel a lot for work. However, nearly all of my travel is to places that have timezones within 1-2 hours of my home, so it is rather easy to know what the time is back home. What I would really like is a quickset hour hand, but unfortunately that is a very rare complication in non-GMT-watches, and even in GMT-watches you are limited to only certain models.
Edited:
 
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Is sub-seconds a complication?

Watches have had sub-seconds since watches had seconds at all. Initially, sub-seconds movements were modified to add extra parts to make them sweep seconds. Eventually designs evolved to incorporate the sweep seconds in without having "add on" parts.

Here is an Omega movement with sub seconds - the original design:



To add sweep seconds, the center wheel is modified to have a through hole. Then a sweep seconds pinion is added that goes through the center wheel, a friction spring, and a bridge is added to hold it all in place. Then a driving wheel is pressed onto the extended 3rd wheel pivot to drive the seconds pinion, like this:



So no, sub-seconds is not considered a complication but sweep (central) seconds is.

Cheers, Al