They were furnished on the original Super 14 barrels, which began production in 1978. They were only on those 14" barrels. They were replaced by the top mounted rear sights with replaceable, different height blades in either 1980 or 1981. I found them to be neither as repeatable nor as easy to adjust as their replacements, when they were used in an environment of frequent changes, such as silhouette matches.
I, too, always called them "side saddle" sights.