I haven't seen much info on the forum on the Master Ultra Thin Date.
I recently purchased a ZF factory model of the 39mm Master Ultra Thin Date that would have the reference Q1238420 in gen.
This is one of my all time favourite classic watches. To me, there are few watches as elegant and well proportioned as the ultra thin date. Even most of the Patek Calatravas don't get the proportions as well as this model. Notice how the second and hour and minute hands line up perfectly with the minute markers and hour indices. It's a beautifully designed piece.
A year or so ago this model was being sold in 40mm, but the new model is 39mm and comes with a solid metal JL logo rather than the printed logo on the 40mm version. Both versions are available from TDs so bear in mind the diameter and main logo material before purchasing. 39mm is considered by many to be about the cut-off for a 'dress watch', this model is on the cusp, has a simple dial with minimal complications and I consider the perfect watch for office wear. It looks good with a shirt and suit but could equally be worn in a casual way.
I used to have a gen Grande Taille, which had the blued second hand and a slightly thicker case with date at 3, but this ultra thin model is more elegant and the symmetry with date a 6, to me is perfect.
On-wrist:
The proportions of this watch are as good as it gets. The bezel is slim, and case is low profile, lugs are elegant. See how the hands are well aligned to the markers, not falling short like so many other dress watches. The hour hand meets the tips of applied markers nicely, not short or over shooting. The date at 6 gives the watch proper symmetry compared to a date at 3 and adds to the overall pleasing look of this watch.
I recently purchased a ZF factory model of the 39mm Master Ultra Thin Date that would have the reference Q1238420 in gen.
This is one of my all time favourite classic watches. To me, there are few watches as elegant and well proportioned as the ultra thin date. Even most of the Patek Calatravas don't get the proportions as well as this model. Notice how the second and hour and minute hands line up perfectly with the minute markers and hour indices. It's a beautifully designed piece.
A year or so ago this model was being sold in 40mm, but the new model is 39mm and comes with a solid metal JL logo rather than the printed logo on the 40mm version. Both versions are available from TDs so bear in mind the diameter and main logo material before purchasing. 39mm is considered by many to be about the cut-off for a 'dress watch', this model is on the cusp, has a simple dial with minimal complications and I consider the perfect watch for office wear. It looks good with a shirt and suit but could equally be worn in a casual way.
I used to have a gen Grande Taille, which had the blued second hand and a slightly thicker case with date at 3, but this ultra thin model is more elegant and the symmetry with date a 6, to me is perfect.
On-wrist:

The proportions of this watch are as good as it gets. The bezel is slim, and case is low profile, lugs are elegant. See how the hands are well aligned to the markers, not falling short like so many other dress watches. The hour hand meets the tips of applied markers nicely, not short or over shooting. The date at 6 gives the watch proper symmetry compared to a date at 3 and adds to the overall pleasing look of this watch.

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