Visited the Musical Instrument Museum in Phoenix today. More photos to come. This photo was in the current electric guitar exhibit, sorry it came out kind of blurry. The only person named in the caption was the steel guitarist, Bob Dunn, but that's undoubtedly Cliff Bruner on fiddle and Leo Raley with his amplified Martin mandolin ... meaning that the group is Bruner's Texas Wanderers.

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Here's another photo of Bruner and the Wanderers with Raley and Dunn, along with Moon Mullican and Raley's brother Red. This photo is much better known:

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Just found the first photo intriguing because I've never seen it before. The exhibit includes a "Volu-Tone" amp similar to the one Raley is using in both of these photos.