Wiktionary
saddle stitch
n. A stitch in which the center of the fold is placed across the saddle of the stitcher and then wire staples are driven through and clinched on the inside.
WordNet
saddle stitch
n. a decorative overcast or running stitch, especially in a contrasting color
Usage examples of "saddle stitch".
It was Elvis Presley time, you know, with the saddle stitch and all of that.