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bitterspeak
·Firstly, the hour subdial on the chrono function of the watch is misaligned and is too fast by around 10 minutes. I have seen the description from Archer on why this may happen so I tried to let it go, but mine seems like it's off by quite a bit. I have tried the trick of holding the reset button and slowly releasing, but this does not fix the misalignment. Pictures below:
Additionally, my chrono second hand is activating the minute subdial about 0.8s to 1.0s too fast, which I have also seen as a problem before in the forums. When it is reset it is slightly off to the left, so maybe this is contributing too. Pictures of the issue below again:
I have a 3861 and I just performed the same chrono test for 4 hours. Here are my findings:
For the first half hour, the hour subdial was pretty accurate. After 30 minutes, that's when the hand on the subdial started advancing a little faster.
Min Subdial @ 46min
Hour Subdial @ very close to the 1 hour mark with 15 min left.
Min Subdial @ 57min
Hour Subdial @ Hand is at the 1 hour mark
Min Subdial @ 60 min
Hour Subdial @ very slightly past 1 hour marker
I repeated this for 4 hours and the hands were accurate to their location from the first hour. This is the picture at hour 3. The picture angle and lens distortion makes the hour hand look a little more severe but it was very close to the 3 hour marker.
Conclusion: The hour subdial is slightly off when it approached the hour marker. I had a friend do the same test on his 3861 as well with identical results so it seems to be common in multiple 3861. Not sure if anyone can report the same movement behavior with the 1861. All in all, while slightly inaccurate, I can still easily tell whether it's the 1st 30 min or the 2nd 30 min. I don't think it's worth the trouble of sending it in for warranty. I'll probably get it serviced a little earlier and get it addressed then.
With that said, I think your hour subdial is the same as mine and I think you may have misread your minute subdial. You believe that it was the 1st 30 min when in actuality, it was the 2nd 30 min. In green is the corrected timing. Instead of 9 minutes, it's really 39 minutes and so on and so forth. If so, this would match with my movement.
Hope that helps!