Most useful complication...for you...

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1. Date
2. Dive bezel to time everyday life things
This was gonna be my exact reply. All of my "nice" watches do not have a date complication because I hate setting them after sitting, but my daily seamaster has a date which I rely on multiple times a day due to a bad memory. The dive bezel I use to time anything from when the next train will pass (for working on the rail) or how long my steaks need to reverse sear. Downside on the 2264.50 is the bezel sucks to rotate.
 
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I find the laser beam and wire garrote to be the most useful. A properly made linked metal or mesh bracelet would also work very nicely for more easily opening twist off beer caps.
 
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Not a complication per se. but a GMT/dive bezel combo would be perfection to me.
 
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Chronograph...absolutely. In my old job as rail traffic controller, trucking, cooking....
 
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I only own three-hander/dates and chronos, so no elaborate functions here. Unless you consider a seconds hand a complication, mine would have to be the date wheel. I occasionally find something to time (three minutes in the pressure tester), I reference the date almost daily. The second hand comes up daily when I gauge the previous day's rate and hack it back to GPS time.

My truly most useful complication is a sleep app on my apple watch/iPhone along with an integrated alarm (AutoSleep and AutoWake) but it's not really a watch.

BTW: @Archer, thanks for showing that it's OK to just dip the reverser in the Lubeta, I was wondering if you might use a separate epilame bottle just for that purpose.
 
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I.............. might use a separate epilame bottle just for that purpose.

A seperate one? Are you kidding?
Have you seen the prices of those f*#king things?
Even a pro watchmaker would be extravagant owning more than one.
 
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Back when I was working, a perpetual calendar actually came in handy. Having the calendar available at the flick of my wrist wasn't really necessary, but was reassuring. Kinda like a validation.




Then, I stopped. (Working, that is.) And all of a sudden, the days didn't seem to matter so much.

So, no more complications for me. Life's complicated enough as it is. Having an expression of time on my wrist is all I want from a watch now.

Art
 
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Not a complication, but a benefit. I wear my Omega f300 (hummer) to bed on occasion. With the watch under my pillow, I find the hum has a soporific effect. Not so my Accutrons. Too high pitched!
 
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GMT and dates for me. Work with multiple time zones. Adding 5.30 hours for some and reducing 5.30hrs for some became old fast (Or so I told my wife why I need to buy a Rolex GMT Master 😀).
 
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BTW: @Archer, thanks for showing that it's OK to just dip the reverser in the Lubeta, I was wondering if you might use a separate epilame bottle just for that purpose.

The parts are cleaned before they are dipped, and I use a dedicated pair of tweezers for this...
 
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Hacking. I like precision and I get slightly irritated when setting my non-hacking watches.

After that, having both the day and the date is my favorite, followed by just the date.
 
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nor if you’re my wife, half or a whole year...

my wife is famous for never setting the time on her watches. It's comical considering her family is in the watch biz in Cebu city. Sometimes her friends would point to her watch and ask what time it is and she would simply shrug.
 
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gmt for me, also happens to be my favorite complication
 
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my wife is famous for never setting the time on her watches. It's comical considering her family is in the watch biz in Cebu city. Sometimes her friends would point to her watch and ask what time it is and she would simply shrug.

My wife sets the time on some watches, but others she just treats like jewelry. Apparently it is related to whether she can easily read the time on that particular dial. If it's too small, or the hands don't contrast well with the dial, she doesn't bother setting it. 🙄
Edited:
 
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My wife sets the time on some watches, but others she just treats like jewelry. Apparently it is related to whether she can easily read the time on that particular dial. If it's too small, or the hands don't contrast well with the dial, she doesn't bother setting it.
I remember people dragging Bethenny Frankel on HODINKEE's "Talking Watches" for this (among other things). I don't think she would have gotten quite as much flack had she not been a reality TV star first and foremost, but I don't want to debate that whole thing. I will say though, I heard Aurel Bacs say that his wife Livia Russo also often doesn't set the time. If we buy watches we like for both their looks and their practicality, are they not also jewelry?
 
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Actually the way I first learned that my wife doesn’t care much about timekeeping is fairly humorous. I had given her an Air King and put it on a winder for her. So it stayed wound and kept reasonable time, but obviously it was going to gain/lose at least a minute or two a month. Well months later it was time to switch to Daylight Saving time and she told me there was something wrong with her Rolex. She couldn’t pull out the crown to set it. Well, it was her first screw down crown, and she hadn’t felt the need to try until then. 😁
 
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I used to think my most-used complications were day/date, followed by the dive bezel.

But since I received my grandfather's old 1969 Seiko Bell-matic, I've become a great fan of the alarm. I set it for any dumb reason I can justify an alarm for. Need to wake up at 6am? Set an alarm. Need to make a phone call at 11? Set an alarm (even if my computer dings at me five minutes before my meeting). Need a coffee break at 2? Set an alarm (even if I'm very aware when 2pm comes about). Need to be reminded to look at watch? Set an alarm. The alarm rings for just 5-10 seconds, but it's loud enough to wake me up, and is so endearing in a mechanical bell kind of way.

.
 
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The watch on my wrist pretty much continuously since December suggests that Day-Date wins, but I’m inclined to say these “complications” are top:-
 
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Countdown bezel. Very helpful for when I'm managing a video production project.

With the right watch, I can have that, a chronograph, day, date, plus hacking seconds. Now, if Sinn would just toss in a GMT, an alarm, and a minute repeater I'd be set.

 
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Chronograph. Its the one that got me started, and makes up the vast majority of my collection. As a filmmaker, timing scenes is critical...and I bought my first chronograph specifically for this purpose. Its turned into an obsession.