Vacheron Constantin

In fact, I had set out to wear this VCQP 43031, my birth year watch, for a week on my wrist... But tomorrow I am heading for the Zoo. It will be hot, humid and if I'm lucky, no rain. So unfortunately this will have to rest in the box. ...  

I hope it’ll be back on your wrist very soon! Best, Emmanuel

to see the first prototype of the Mercator by Jean Genbrugge, the one he created then revealed to Claude-Daniel Proellochs. It featured the same case and base movement as your QP. SJX image ...  

...similar case, but perhaps different lugs. ...