A variety of contouring can be found on my money clips to give a distinct look.
Here you can see the backs contoured in 3 different ways: lower, mid, and upper:
A contoured lower-back gives the money clip a streamlined look. These are in varying degrees with even the slightest contour. A contoured mid-back gives the money clip an hourglass look for a different visual appeal, and a contoured upper-back gives the money clip a unique sculpted look. It is also found on my popular Contour Cut Series (see Part 2 here).