Perpetual Calendar 1939 to 1966

"U.S. Mail from New York World's Fair 1939" mailing bag and original tag. The bag pictures the "Trylon and Perisphere" on one side and the back is blank. Address and stamp are put on Tag and then this can be mailed. From the tag, it seems that the bag was to be used to mail photos to the other person. Size: Bag: 4 3/8" high by 2 3/4" wide. Tag: 3 3/4" wide by 1 7/8:" wide.