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
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AC4 fans should also be sure to check out the Baldric model I also offer thru my shop! Link:
PIRATES BALDRIC PART SET