Hmm... the frame looks very much like mine. I've got the NP-17 Norc in the two-tone finish:
I changed the grip shown in that picture to a non-wrap around wood one shaped like yours, and the hammer doesn't bite my hand anymore. It looks much better too, but I don't have a pic handy at the moment.
Oops, forgot to mention. This gun was advertised when I bought it new as having a "chromed frame". So there ya go.