Movieland Mystery Photo [Updated]

Los Angeles Times file photo

[Update: This is the filming of “Buffalo Bill,” starring Joel McCrea.] Here we have horses, cavalry soldiers and puffy white clouds…

[Update: Here’s the caption information on the back of the photo.] Our mystery camera crew has covered the camera with a heavy blanket … because of noise? … because of dust? It’s a mystery! … and here’s our mystery soundman … … our mystery cavalry soldiers … … a mystery cannon with a pyramid of cannonballs… … our mystery talent in a lot of fringe …  … and our mystery guys standing around.