• There are no copyright markings on either side of the ticket, which was produced for distribution to the public for admission to the Philip Morris Program radio show as part of the studio audience on the day shown on it.

• The item can be dated by the date the ticket was valid.

• It was issued as a promotional item--the intention being promotion of NBC Radio and the Philip Morris Program by way of allowing a listener/ticket holder to be part of the radio show's studio audience on a given day. Tickets for radio and television shows are given for the asking by networks and broadcasting stations; the front of the ticket says "Void if sold."

From Cornell University: Cornell University The Cornell information indicates this image is in the public domain:

"For works first registered or publisher in the US: "1923 through 1977 "Published without a copyright notice "None. In the public domain due to failure to comply with required formalities."

• United States Copyright Office page 2 "Visually Perceptible Copies The notice for visually perceptible copies should contain all three elements described below. They should appear together or in close proximity on the copies.

1 The symbol © (letter C in a circle); the word “Copyright”; or the abbreviation “Copr.”

2 The year of first publication. If the work is a derivative work or a compilation incorporating previously published material, the year date of first publication of the derivative work or compilation is sufficient. Examples of derivative works are translations or dramatizations; an example of a compilation is an anthology. The year may be omitted when a pictorial, graphic, or sculptural work, with accompanying textual matter, if any, is reproduced in or on greeting cards, postcards, stationery, jewelry, dolls, toys, or useful articles.

3 The name of the copyright owner, an abbreviation by which the name can be recognized, or a generally known alternative designation of owner.1 Example © 2007 Jane Doe."