http://www.youtube.com/watch?v=pgzeLlBjD6Q
Isn't this Joaquin? I have seen so few pictures of him from 1944-45 that I can't be positive. It looks like the same guitar he played in "Rockin' In The Rockies", the Three Stooges movie with Spade on "Miss Molly", also from 1945.
Here is a series of 4 screen caps. The top 2 are from Rockin' In The Rockies. The bottom two are from the Shame On You soundie and show Johnny Weis on standard guitar as well.
You can see the same discoloration on the front edge of the guitar in all 4 pictures. I assume this is his 1945 Bigsby in all cases?




The hairline, hair color, player's stature, and the guitar look alike in all 4 pictures.
But I don't have any info on pre-Murphey steel players for Spade and I suppose someone else may have been standing in for Joaquin in Shame On You. There aren't any hot licks that would immediately identify him.