I picked up this beater around Jan of 12 I think, for $125 +tax. Some gouges and no front sight. Put an old 4x15 scope on it then got a front sight and screws (no washers but worked w/o them) from Bob's Gun Shop
for about $21 I think. I also have a 10C, it uses mags (got it for $30
Here's the 10C (part of it anyway).
ETA: The 66 is, I think around a 1964 model, no serial number.