Comments:
My old and dearly departed ultra thin. It was a beauty.
Unfortunately it got very little wrist time.
Ultrathin with a warm rosegold color and not mentioning the excellent movement, best ultrathin watch. [nt]
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Very nice!
That reminds me! Time to wind the Master Ultra Thin. Mine is the 38mm version. Which means more case, same tiny movement. Does yours run fast all the time? Mine seems to run fairly fast when fully wound and even faster when less fully wound. I can gain two minutes in about one to two weeks! Obviously no seconds hand to see the actual daily rate.
The 38 mm has a thinner case, from memory. The one I posted is not mine. I still have to find it. ;) As for your movement, did you think of demagnetizing it? [nt]
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Exactly my thoughts and I responded to Patrick's post before reading your reply 😉 [nt]
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Hmm, I'll go find a compass and see if it's attracted to the watch! I hadn't thought of that yet!
Say hypothetically, I'm gaining what appears to be "2 minutes" but without a seconds hand I can't be sure, maybe it's just under 2 minutes and let's say it's around 10-14 days. Gaining 100 seconds in say 12 days - averages out to only 8 seconds a day, which isn't that bad for an ultra thin watch. Eight seconds a day seems to be too small for a magnetism, which is why I didn't think it was a magnetization issue. I have a second JLC Master Ultra Thin with the 849 movement, that one seems to run fast, but not noticeably like the MUT 38. I'll try demagnetizing it the next time I'm in the city. Can't hurt.
I think that should resolve the issue. If not, they it might need to be regulated 👍 [nt]
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Your MUT might be magnetized Patrick. You might want to have it de-magnetized or checked. I have a MUT 34 and it runs pretty accurately 🤷♂️ [nt]
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That's encouraging to know your MUT runs accurately. I've always expected Ultra Thin timepieces to run less accurately, so that's why I didn't think this one was magnetized until you mentioned it! [nt]
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Well the MUT still goes through the same stringent 1000 hours test that JLC puts all of it's watches through so it should be capable of the same tolerances...
And if I remember correctly, this ultra thin caliber is developed and assembled in the same department as their grand complications (haute horology).
Yup! Indeed! All correct!
They have slightly lower tolerances for the MUT, despite the 1000 hours test for the 849.
Queries on MUT
As I am going to purchase a MUT date soon, may I know why the slightly lower tolerances vis a vis MC?
And what is the accuracy for the 899/1?
And what is the accuracy for the 899/1?