I found this wonderful birthday postcard in Grammie's papers. Since this card was obviously hand delivered, I am pretty sure it was from Grammie's best friend, Martha. I'm not sure who Bonnie was, but apparently she was one of Grammie's teachers (probably at church). It looks like Martha's name may have been added later, as it is in ink instead of pencil.
I'm not sure when this card would have been printed, but I am impressed by the bright, vivid colors used.