Dr No[Moderator Omega - Wristscan]
37648
Not as simple, and not nearly as elegant . . .
. . . but I will admit to copying the charcoal grey strap with light grey contrasting stitching from Lange:

I'll be wearing Dad's '65 Seiko Sea Lion today and tomorrow . . . possibly back to G O for Sunday at my usual haunts . . . cordially, Art