I just brought up the article (circa 2007) mentioned in The E-Sylum for December 27th. It is interesting but doesn't really get to the point regarding calendars. My father and I wrote up calendar medals and store cards from in The Numismatist from 1956-59 and 1971-74, listing over 300 different calendars. Serially printed, the listing runs well over 125 pages. I am hoping to reprint these listings but am waiting to get a good OCR program to scan pages.
An article by A. J. Turner in the American Journal of Numismatics volume 5-6 (1993-94) discusses calendars but had no idea about the extensive listings in The Numismatist. A private publication by James O. Sweeny in 2003 is a wonderful listing of British calendars starting with the British Museum copy of Samuel Morlandl of 1650. Recently Bob Levinson of Los Angeles acquired the earliest calendar medal that I know of, dated 1582, listed in the famous Van Loon catalogs from the 1700's.
I am in the process of updating the calendars, especially starting with the 3 inch (76mm) first from the French Mint in 1964 which started series by MACO, Franklin Mint, Hoffman Mint and Metalcraft. Other three-inch medal series are from Korea, Poland and Portugal.
I am preparing a short article for the MCA Advisory on the subject of three-inch medals, (As the token Corresponding Society notes, most medals range from 37-44mm. The 76 size is a new development.
George's note gave me an opportunity to mention one of my favorite numismatic books, Tempus in Nummis by Turfboer and Sweeny. George didn't have one, but I found a copy for sale on Scott Semens' site and George ordered it. I hope he likes it, too!