It's not BoB era, but it's a beautiful shot! I''d say this is late 1940 (or late October 1940) to early 1941. The pilot appears to be wearing a 1941 pattern mae west. It may be the BoB 1932 pattern, but the colour looks off (unless he doped the whole thing yellow)
Also, the white-band on the spits fuselage didn't appear in the BoB I don't think
But man these are some great shots. I can remember seeing them in a life magazine from the period
