Hey, I believe the combination with an extra colour like brown adds depth and makes the watch look very elegant and versatile. Black would add no further colour and makes the look kind of monochromatic. Again, it is a matter of personal taste.
I am throwing in some fotos from instagram, as I own no Speedy (for now)
馃槑
I paid no great attention to weather or not these examples were the exact same reference. With your watch, which has vintage lume it would look even better, I believe. You could wear it with almost anything, IMHO.
Cheers!