amanico[JLC Moderator]
402934
Jaeger Lecoultre Master Steel Black Series.
Following our friend jml's post, here is a superb series created by Jaeger Lecoultre at the end of the 90's early 2000's.
The 37 mm are:
The Master Perpetual Calendar:

The Master Calendar:

The Master Reserve de Marche:

The smaller is the Master Ultra Thin 34 mm:

The bigger is the Master Géographique with its 38, 5 mm case.

And, in between, the Master Memovox, which is 36 mm big:
A wonderful series, here. My favorite? The Memovox, with the MUT as a close second.
You?
Best,
Nicolas