Haris,
Thanks for this posting and for your subject title question. As the owner of a 3714-45 on deployant, my first impression of the OEM Black strap was that it was to much of a stark contrast on this particular variation so I elected to go Brown like you. No disappointment as it really enhanced the RG markers and softened the overall look as your pic's acknowledge.
My AD also suggested as a option to mix it up a bit the dark navy blue on deployant. When he put it on, I was truly blown away. This combination was a subtle change from the black, but enough to bring out the color of the blued "counter" hands. The navy strap also sports up the model to a even higher level yet if a dressier occasion calls, this fresh look works just perfectly.
Next time you visit your AD/Boutique, take a look at this pairing in the flesh, I'll bet you will experience the same feeling I did....WOW !
Let us know what you think should the opportunity arise.
Enjoy your 3714, she's a beauty.
Best,
Andy