A Cachet is: a design of words and/or pictures which refers specially to the new stamp on the FDC (First Day Cover). Designs are usually found on the front, left side of the envelope (cover). They can be printed, rubber stamped, individually hand created, or pasted-on. The purpose of a cachet is to enhance the meaning and appearance of the cover.
A First Day Cover is: a new stamp issued by the U.S. Postal Service (USPS), it is offered for sale in (usually) only a single U.S. city on ONE day and then throughout the country on the second day and thereafter. That date of sale in a single city is designated as the "official" First Day Of Issue. Envelopes (known in stamp collecting as "covers") postmarked with the new stamp with this first day date are known as "First Day Covers".
Winfred Milton Grandy CD:
The CD pictures virtually all his cachet and postcards. The authors draw on their personal knowledge of Mr. Grandy to round out the picture of this amazing man. Also pictured is a large amount of Grandy ephemera to give context to his life and philatelic achievements. The CD won the following medals: