(Courtesy of Ed Phillips)
Above - Rex and an unidentified actress in an unknown film, possibly a Fox silent. Hans Wollstein adds that she is definitely not Lola Todd (TAKING A CHANCE) or Caryl Lincoln (WILD WEST ROMANCE), both of whom he'd recognize. That leaves Mary Jane Temple from THE COWBOY KID (Fox, 1928) or Patsy O'Leary of THE GIRL-SHY COWBOY (Fox, 1928).
Bell's jacket looks more like a uniform rather than a suit coat. Perhaps this is from one of his non-western talkies. The code in the lower right corner of this photo is either "CI-50" or "CL-50".
(From Old Corral image collection)
Above - Rex has a trio of villains under wraps in this scene from MEN OF THE PLAINS (Colony, 1936).
(Courtesy of Ed Tabor)
Above is a great crowd scene from the IDAHO KID (Colony, 1936). The heroine providing first aid to the prone Rex Bell is Marion Shilling. Crops/blowups below.
Leftside blowup of the IDAHO KID shot above: from left to right are Earl Dwire, Jack King, Dave Sharpe, Sherry Tansey, Charlie King, Lane Chandler, Buck Morgan. In the back with the moustache and white hat is Herman Hack.
Rightside blowup of the IDAHO KID shot above: George Morrell restrains Lafe McKee; Phil Dunham to the right of McKee.