This is my S prefix 57 that I bought supposedly unfired (though it clearly had been, even if only a few rounds) in the presentation case with unused tools, papers etc. I have owned several 57's/657's now, but this is my favorite so far. These grips were made right after they dropped the diamond center, and they are much narrower and far more comfortable than later target grips. This gun also has some of the most beautiful case colors on the hammer and trigger that I have seen on any gun. The pics don't truly show how brilliant they really are-