David, I guess its the Connie
I will have to go with Treadigraph's explanation as well. Looking at the timeline for the Constellation/C-69's early days, there is no way that it could have been in service in 1943, let alone 1942 as indicated for the 859th.
Thanks everyone for all the interesting information about this photo! After a tip, I have also sent it to the Harrington Aviation Museum to see if they have any thoughts about it. I think it will remain a mystery as to how it relates to an RAF mechanic, but it is unearthing some very interesting aspects!