Art, to give you an idea of the size of it: it's exactly the same size as the hole in the 2x2 in which I sent you the 5 cent, it's a real tight fit.
And unlike the 5 cent coin, the 50 cent coin does have the mint mark and privy mark that are common on coins struck by the KNM, you can see them in the ring that says "NEDERLANDSE ANTILLEN" at either side of the stem of the orange branche.