Here are two Pinco U-631's. One is a bottom rest and the other a top rest. The bottom rest has an inner skirt that extends about 3/8 " beyond the outer skirt.

Common stuff with interesting differences.

Kindly take a peek at both pictures. This is just something fun I discovered digging around the boxes of stuff in Maddogs Garage. . .a mighty fine place it be.

^..^