The Sedgley and many other prewar US sporters used the larger snap swivels that were also used on the earlier Winchester Super Grade rifles. The modern smaller-size Michaels, Recknagel and others are miniatures of the original SG style.
Here's a photo illustrating the difference.
The early SG swivel is the one in the middle while the later Michaels type is one the viewer's right. The left-side one is a military model that can be used on the SG-size swivel bases. Most of the other artifacts shown are bench-made items.
Regards, Joe
