I sold a "France Field" like yours on a postcard last month for $15.
France Field certainly not as ubiquitous as Balboa, Cristobal or Balboa Heights, but it is not a rare cancel (now if you had a La Boca cancel, be sure to let me know).
It is a bit funny to think that I have been to each of the towns/bases that you have cancels for.
Not in 1940, though.
In fact I was in Panama recently (3 weeks ago). Albrook Air Field is now dominated by the Albrook Mall. Something to rival the "Mall of America" here in Minnesota.