It also says:  Cordially Yours,
Gerald D. Bliss-retired
Box1 Miami Postmaster, The Panama Canal
1905-19??  (I can not read the last 2 numbers.

The lady is my Grandma Ginnie End White, Postsmistress, Rattlesnake Florida U.S Post Office Tampa Florida, altho I dont know the man. Maybe Grover White??

Granddaughter:  An End McQuaig