Avalon Ballroom 11/28-30/68
The original poster was printed on uncoated index stock and measures approximately 14⅜″ x 20″.
The postcard comes in two types. Both measure approximately 4⅝″ x 6⅝″:
The Type A card has a “place stamp here” reverse.
The Type B card has a bulk rate permit on the back. No copies are known to have been mailed to people on the Family Dog mailing list.