They have S.C. initial in center with holly leaves along the border on both sides.
These cuff links (5/ 8 inch) are made from buttons using a special shaped cuff link attachment. Picture shows front side as well as back side of the cuff link pair.
There is a 1-inch companion button that is often used on shirts and vest.
The button by it self would be good for cuffs of shirts that are not French cuffs, or if you wanted smaller buttons for a vest or woman clothing.
They are brass buttons with gold plating, from WBB