ACCORDING TO AN ARTICLE IN THE APS JOURNAL, "In 1956, Monaco issued a set of stamps to honor the marriage of movie star Grace Kelly to Prince Ranier. Almost everything to do with these stamps (from blocks of four to first day covers) are, today, rather inexpensive. However, true commercial usages of any of the stamps are quite rare. This seemingly common piece of mail from the Lancome perfume people is a major find worth well over $100!" THIS COVER HAS NO CONTENT.