Dr No[Moderator Omega - Wristscan]
37693
In absolute terms, perhaps. I'll leave that determination to experts. But within historical context, my candidate . . .
. . . would be Longines 13ZN chronograph movements.

[photo credit: Nicolas]
Obviously, Longines vintage movement isn't as immaculately finished as the G-F, or any KV or PD. But given the context of it being produced with tools, techniques, and materials available in the middle of the twentieth century and considering it was standard production, I would give it the nod as the most appropriate candidate for the honor.
Art