Jaeger-LeCoultre Master Ultra Thin Tourbillon Moon

quattro · 2025-11-22T08:20:11Z

Explore the Jaeger-LeCoultre Master Ultra Thin Tourbillon Moon (ref. Q169242J). Is this JLC's overlooked masterpiece? Dive into its unique radial date and caliber 983.

Emmanuel (quattro) brings to light the Jaeger-LeCoultre Master Ultra Thin Tourbillon Moon, reference Q169242J, a timepiece he observes is conspicuously absent from common horological discourse. His post invites the community to consider whether this lack of attention is justified, prompting a deeper look into its unique complications and design. This discussion serves as a valuable re-evaluation of a potentially overlooked JLC masterpiece.

The Jaeger-LeCoultre Master Ultra Thin Tourbillon Moon, ref. Q169242J is almost never talked about.

Rightfully so? What do you think?

The pink gold case measures 41.5 x 12.1 mm and the watch is powered by self-winding caliber 983 which features a tourbillon, a moon phase display and a radial date jumping over the tourbillon (from the 15th to the 16th).

Best, Emmanuel

credit: @watch_i_love (1), The Eclecticum (2-8), @horologytrinkets on watch crunch (9-11) & Deployant (12)

Key Points from the Discussion

The original author highlights a similar radial date jumping mechanism found in the Arnold & Son HM Double Hemisphere Perpetual Moon, suggesting a shared design philosophy or inspiration for this specific complication.
A contributor expresses that, at its price point, there are superior alternatives available in the market, implying a potential value proposition concern for the JLC Master Ultra Thin Tourbillon Moon.
This thread is discussion-light, with only a few substantive replies beyond the initial post.

The Discussion

amanico

Nov 22, 2025

There is a confusion between the family name ( Ultra Thin ) and the thinness of the watch ( which is not Ultra Thin with more than 12 mm high ). A serious looking watch, accurate, but which never sang to me.

For that price, there is much better to find... Best, Nicolas

quattro

Nov 22, 2025

I agree with you on all counts!

Best, Emmanuel

amanico

Nov 22, 2025

Go for a good old 5100. :))))

quattro

Nov 22, 2025

Oh, yes! This one doesn't come even close! It's night and day, really.

Marc Obermann

Nov 22, 2025

It is a beautiful Jaeger-LeCoultre but as already pointed out not an Ultra Thin watch, it is not even Extra Thin even if it does have a Tourbillon.

Marc

quattro

Nov 22, 2025

Yes, as amanico mentioned, the "family name" (ultra-thin) does not correspond at all to the actual 12.1 mm of thickness!

Best, Emmanuel

Jaeger-LeCoultre Master Ultra Thin Tourbillon Moon

Key Points from the Discussion

Continue the conversation

Related Articles