There are are series of photos here:
http://500thbombgroupb29.org/gallery...rews/index.htm
Note that number 50 (Z square 50) does not seem to be named. The photo you have seems to have been taken after 44 missions.
The photo of the plane on the link was taken a little later (after 53 missions).
On this link, Z-square 50 is called "Fancy Detail", and the pilot was Braden. Other sources say the plane's serial number was 42-24696.
http://500thbombgroupb29.org/Records...More%20500.pdf