The full photo shows part of the N-number, which appears to be N79065. Seaboard leased that aircraft on 12/19/47. From the first-generation uniforms, we know that the photo was taken no later than 1950. The only person definitely identified is Eugene Greider, second from the left, whose daughter contributed the photo. If you can identify any of the others, please let me know.
My guesses (from left to right):
1. Howard Schlag (Pilot)
2. Eugene Greider (Pilot - confirmed)
3. Bill Jamieson (Nav)