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Wrist Check

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Omega Speedmaster Professional. Sapphire sandwich model.

I've got tiny wrists (~6") but I love the history and aesthetic of the watch. Plus it was a gift.

The Omega SS bracelet scratches and scuffs fairly easily and has a nifty micro-adjustment feature, but it's always too loose or too tight for me. Lately I prefer to use a leather NATO.

It gains 4-10 seconds a day depending on if I wear it during the day and the resting orientation when it's set down on a table. I've been trying to find the best position to minimise the gain and have only tested face up and down so far. Face down is more consistient at 4-8 seconds a day. Crown up has similar results to face up orientation.
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Case width: 42 mm

Thickness: 13.8 mm
Lug to Lug width: 48 mm
Water Resistance : 5 bar (50m)
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Jefffa
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C0PED0G
28
Aug 27, 2016
Best most beautiful display caseback of all time imo. Lovely! My grail watch
ChristopherJ
1189
Jun 27, 2016
Nice SSandwich. A note regarding your regulation experiments- if a watch is low on power reserve, it may start to run fast. This is because the mainspring won't supply the balance wheel with sufficient power to do full oscillations. (This roughly starts to happen under ~10 hours of power reserve on a typical 40 hour caliber.) The balance wheel will start to "cut corners" and make rotations that are ever so slightly shorter than the full distance and this upticks the beat rate ever so slightly. Over the course of several hours on low power, these milliseconds of cut corners can stack up and it can equate to a few seconds gained. It's just one possibility that low PR contributed to seconds gained. But as we know, there are many other possible factors.
Every watch reacts a little bit differently, so this may or may not be useful information to you. I'm just spitballing because yours runs fast and manual watches are not always topped off in the same way that autos are. I've always found it interesting to hear what other people have found when they regulated their watch. It's so nuanced. I've been able to get one of my watches to do +/- 1 sec/day. It just has to be fully wound, stored face down and it can only hold it for 2-3 days before it starts to gain a few more. But just to keep things in perspective, we're just counting seconds here. There are 86,400 seconds in a day, so a watch that is +/- 8 sec/day is still 99.99% accurate.
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