New Vacheron Constantin Historiques American 1921.
There are several versions which are unveiled, this year.
Two versions in white gold: 40 x 40 mm and 36, 5 mm.
And one in platinum, from the Collection " Excellence Platine":
For the record, the Platinum is not the first, as they launched the former one in 2016:
The 40 mm version is 8, 06 mm high. The 36, 5 mm version is 7, 45 mm high.
The movement is the same: Cal 4400, manual winding. And they all have a see through case back.