El Cazador 1/2 Real 1782

Hola, just received my first El Cazador shipwreck coin, a 1782 1/2 Real. I collect coins of '82, so a collection of these is highly necessary. So go me! Anyone have some of these? Every once in a while I see a fairly nice 8 Real comes up, but don't hardly ever see coins too much better than this as 1/2, 1, or 2 real. I know the 4 Reals are real tough to find in general. Is there a population report on what's been pulled? I'd love to know if a 4 Reals 1782 even exists off the wreck to look out of. On this coin, the obverse is pretty well worn down, but the reverse is nicer than the pics lets on.