Well, your gamble bought you a genuine civil war era C.S.A. button. It was made in England during the war by the Birmingham button-manufacturing firm of Smith, Kemp, & Wright. All known specimens are non-dug, from a batch that got hung up in Bermuda at the end of the war due to the yankee naval blockade of Southern ports. None of these SK&W "Superior Quality" backmarked CSA buttons has ever been dug in America, but they are accepted by collectors as having been made soemtime in late-1864 to early-1865, for the Confederate States of America. They were just a bit late in arriving.
Important note for collectors:
Note that you have to turn the button to read the Superior Quality backmark. If you don't have to turn the button to read Superior Quality... put another way, Superior appears "above" Quality, like this:
Superior
Quality
it is a modern reproduction CSA button, made for civil war battle re-enactors... the Waterbury Button Company sells them online for about $2.