I must admit I don’t know a whole lot about Caleb S. Bragg or Mercer, however I came across this foto in the fantastic Library Of Congress Archives on Flickr. Apparently from a bit of research, Bragg was the fastest qualifying race car driver in this Mercer for the 1913 Indianapolis 500. Cool foto, from a very cool archive of classic old & vintage fotos.
foto of the day. Bragg & Mercer