taking a completely uneducated guess, I'd suggest this one isn't from Murray - apparently he worked at S. & W. for seven years from 1932, if that helps at all. I'm not sure when the name changed to Brierley, and as Keith mentions, it look to be the case that for those pieces that he was responsible for, then his name mostly accompanied the factory name.
This one looks too compact and tight for Murray - makes me think more of a Kny or Irene Stevens sort of decoration.