Quote Originally Posted by BrianShaw View Post
In fact, it looks like it might be a bracket for a Graflite!
Actually it looks like the two brackets that are traditionally used by the leather strap on a Graphic press camera, paired with a reinforcing metal strip. If properly spaced (vertically) these also do double-duty as a secondary Graflite mounting point, as they are the same connection point form factor as the one-piece Graflite bracket that usually lives on the other side of the same press camera body.

So yes, they probably held a Graflite Synchronizer tube topped by an appropriate flashbulb reflector head. Don't think I've ever seen that before on a TLR.