A close look at the coin reveals whyat appears to be a mint mark of “S” and the letters “VDB” on the obverse.
Also, my apologies for not linking to the larger image, which is here (but width-restricted in HTML). A right-click to open in new tab or new window allows a better look for anyone interested. Oh, in fact, I set the link up here so that it will just open in new tab/window by clicking on it.