It´s 40mm.
I´ve got one from Josh 4 months ago.
Truly amazing rep! the dial is xtra sharp and the movement on seconds sweep is very smooth.
The hands are very delicate with a blue/greyish tone.
The strap looks cheap, so I swapped mine for a black intertwined nylon strap and it looks gorgeous.
Overall, the aesthetic is very elegant, so elegant my wife stole it for her!
Unfortunatelly the movement is not very reliable (it got 2 repairs so far= 30 euro plus on repair service).
... oh, and it doesn´t have the minute repeater function, but if you are on vintage looks this one is a sure buy.
regards,
marco