Hello Ed,
Thank you for the small tutorial :)
I know I am too picky but this is the reason why I would like to switch from poly to nurbs.
I would like to have perfect shape there.
I tried your method and I had same issue like you.
The weird dent (marked as BLUE) and the curve is not going as precise at it should - more curved and the end of strap is exactly same shape as watch part (marked as RED).



Please check the reference picture. It is really pain in the ass for me :) I am trying it for 15-20 h.

Best
Maciek
:)