The original Super 14's circa 1978-early 1979 came with this "side saddle" type of target sight. It is of the Williams style, but much of it was cast,and I believe was either made by T/C or sourced from another supplier. In any event, they were indeed used by many of us who were shooting silhouettes at the time. They were sturdy enough, but were not quick to adjust and not as easy to keep track of adjustments as those that were introduced in 1980, and remained the standard rear sight for many years. I still have several of the original "side saddle" sights in my parts boxes. The standard Super 14 front sight shown on your gun was also replaced at the same time as the rear sight, about 1980.