(1) The symbol © (the letter C in a circle), or the word “Copyright,” or the abbreviation “Copr.”; and
(2) The year of first publication of the work; and
(3) The name of the owner of copyright in the work, or an abbreviation by which the name can be recognized, or a generally known alternative designation of the owner.

The Copyright Office’s circular points out that the year of first publication of the work is the year that the work, original or derivative, was first published. It also notes that “the year date MAY be omitted where 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 any useful articles.”