1800's style 3 inch, 2 Prong Buckle. Styled from that worn by Edward Kenway from the upcoming AC4: Black Flag game.
Use with a 3" wide belt such as Tandy Leathers' 3" x 50" cowhide leather strip #4578-00
or Tandy Leathers' 3" x 66" cowhide leather strip #4579-10
AC4 fans should also be sure to check out the Baldric model I also offer thru my shop! Link: PIRATES BALDRIC PART SET