This is a pair of Cavalry buttons. There is a Coat size button. Which is missing the shank. And has a small push right bellow its left wing. Its back mark is Scovill MFG. And then the other is a cuff button. It has a small pin hole right above the "C" . But only mentioned for exactness. It has its original shank. But both are Union Cavalry buttons.
Item number: CS199