none said:
'Star Wars': Comic-Con '76 pics!
<img src="http://img2.timeinc.net/ew/i/2011/07/19/Star-Wars-1976-summary_523.jpg" width="523" height="610" />
and this might be the oldest reference photo of SW out in the wild: (but looks like a still not part of the film...)
<img src="http://img2.timeinc.net/ew/i/2011/07/19/Star-Wars-1976-comic-con_610.jpg" width="610" height="458" />
No collection of comic-con '76 pics is complete without this one:
http://i209.photobucket.com/albums/bb174/dubbl-t/hamill1976.jpg