Well, looking up "Blue Ridge Boys" and "WLBR" together brought me to a newspaper article (from a Lebanon, PA paper dated to 1954) of their being featured on television. I'd guess that this photo shoot is from that session since I can't find any other references to them on the air.
These guys sure have good taste, though! There's a double-neck Fender lap steel and Telecaster, Gibson archtop (early 50s sunburst ES-300?) and a first-generation Fender Precision Bass hiding in the back.
Considering the "popular stars of stage, television, radio" script at the bottom, I would assume that this was a publicity photo.