New Release
Amanico's insightful review of the 2021 Jaeger-LeCoultre Master Ultra Thin Moon novelty offers a crucial look at the subtle yet significant updates to a beloved reference. His detailed comparison of the 36mm and 39mm cases, alongside the enhanced Caliber 925, provides essential context for collectors considering this elegant dress watch. This article synthesizes community perspectives on JLC's design evolution and mechanical refinements.
Recently, Jaeger Lecoultre revisited the Master Ultra Thin Moon. They offer it in a new 36 mm case, which is really nice with its opaline dial and its " improved " Cal 925, and in a 39 mm case we know since 2011, but here, slightly slimmer as the first one was 9, 9 mm, which is 9, 3 mm high, now. Even slimmer than the 36 mm case which is 9, 4 mm high!
The MUT Moon 36:
The water resistance doesn't change. It is 50 meters.
The big change is the dial, which is soleillé blue, and a redesigned moon phase.
The other improvement is mechanical. The Cal 925 does have a power reserve of 70 hours, now, like some of the Master Control unveiled in 2019. A real improvement, as it had a power reserve of around 40 hours, before. To be precise, before 2019, as this novelty was inaugurated with the Master Ultra Thin Moon with the mighty guilloché blue enamel white gold case.
This technical improvement can be found on all the MUT Moon 39 ( and 36 ) since this year. That means that if you want the opaline version, or the black one, or the 36 mm, you will have this longer power reserve. Good news, isn't it?
The MUT Moon 39 Black:
Now the big question is to know which is my favorite. The Guilloché blue enamel is not the one I prefer. The cost is too high for me, and even if it is a eye catching one, I would prefer a smooth blue enamel, truth to be told.
The White Gold MUT Moon 39 Guilloché Blue Enamel:
No, in reality, I am more hesitating between the black and the new blue.
How did they almost-double the PR? Did they add another barrel?
I’d heard about the new oils, but didn’t know about the other improvements. 👍🏿
I’ve been eyeing the petrol blue for a while. It could be sooner or later. Great post and great job JLC.
But I bet that I would prefer the blue.
imagine this were manual wind 🤔 and 36mm, those were my reservations during my prior ownership of the white 39mm and which I let go for feeling sterile. JLC are getting close🤞🤞
I was very lucky to try on the new blue dial MUT Moon on Saturday and I have to say it’s STUNNING, it seems to be so much better than the blue RDM….it’s very tempting but I have the silver dial version already and except for the lack of 70 hour power reserve it’s all the JLC circular dress watch that I really want. This photo was meant for my personal record only (hence the quality) but as my favourite place for JLC chat is discussing the watch I’ll post it here
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