from my investigations LBG carried 64 on both sides
and the name "LADY be Good" below the CoPilots window.
there is no photographic evidence of this that I can find...but...
-I have information from Museum sources
-an existing AirForce Museum scale model features the name
-and lets face it, its odd to not have seen the name painted on aircraft at that time
I have taken some artistic license, and based on what I see in the museum information
and what I know about other painted lettering at that time, this is what I have created: