Just to extrapolate on my last post I did crack open this watch and did some tuning after measurements. I don’t have a way to check for beat error, so this was just on daily rate using a smart phone app which I’ve used with every watch I’ve tuned myself. First number is before, second is after adjustment all in seconds per day. Both sets were done with the back on and in a sealed box to reduce error from outside noise.
Dial up -13 / +4
Dial down -20 / -1
Crown up -20 / +1
Crown down -43 / -5
Positional error seems very good now adjusted, it just seems the adjustment slipped somehow. It’s always lost time since I had got it, but usually about 3 seconds a day dial up in the watch box. All Seikos seem to “settle” over time for me so I’m not going to call this an issue if it’s not irratic.
I've got 2x 6r15's and 1x 4r36 and i must say the 4r36 has been the most consistent. It also cops a flogging and in and out of the surf on a regular basis. The 6R15's receive regular usage and whilst they're not totally inconsistent, apart from the longer power duration, i don't consider it worth the premium.
I personally won't buy another 6r15 again and would much prefer the 'cheaper' 4r36 movement
Just wanted to chime in that most watches I owned with the 6r15 movement have been a nightmare in terms of accuracy. I have owned watches with the 6r15C movement that apparently has an issue that results in low amplitude, but the 6r15B in my Seiko SARB070 also shows low amplitude and the timekeeping varies a good amount depending on the position. I tried demagnetizing it to see if that was the issue, but it looks like the movement might just need a service after all.
Omega GenŤve Ref. 136.011SP, Seiko SARB070, Orient Star RE-AU0004B00B, Seiko SUN043
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