In the Spring 1979 issue of The Sherlock Holmes Journal (Volume 4, Number 1, Whole Number 52), Editor Nicholas Utechin has this nugget in his Editorial Notesfeature:

New Objects

Pride of place-just-goes to the newly available Sir Arthur Conan Doyle medal produced by the French Mint. Members may perhaps have seen it reproduced in the SundayTelegraph on 18 February, under the heading `Elémentaire'! On one side of the medallion is a likeness of Conan Doyle; on the other five police helmets interweavedwith smoke from a familiar pipe. Two versions are available, depending upon the state of your pocket: £48 in silver, £7 in bronze. With no more information at thisstage, I can only assume the French are, firstly, preparing for the Fiftieth Anniversary celebrations next year (A.C.D. died in 1930) and, secondly, atoning for Mutrux.

OBVERSE: 1859 / 1930 / (facing bust of Conan Doyle, from waist up and wearing a sweater, in front of two stacks of books) / SIR A. CONAN DOYLE

REVERSE: (five British Police Officer "Bobby" helmets, with smoke from a single pipe interwining among the helmets)

We have held off posting about these medals for over three years due to the fact that we cannot confirm the existence of the silver medals. We have not seen any examplesourselves and are not aware of any Sherlockians or numismatists that can confirm they physically have seen the silver version of the medal.

On a recent trip to New York, I had the opportunity to visit the library of the American Numismatic Society and peruse their copy of the Catalogue GénéralIllustré Des Éditions De La Monnaie De Paris. This 6-volume set consists of over 2,500 pages and is the "official" record of all items made by the Monnaie De Paris.The silver medal is not mentioned, while the bronze and copper specimens are listed.

Likewise, the catalog Leygue A La Monnaie De Paris, with all of Leygue's works listed, does not list the silver medal either.

Efforts are being made to locate a copy of February 18, 1979 issue of The Sunday Telegraph, to determine if we can gather any additional information. We believe thesilver medal does exist, as it was specifically mentioned with a quoted price for purchasers. Catalogs have been known to miss items, although we are troubled by the fact that a1985 catalog would be missing an item from 1978-1979.

To read the complete article, see:
The 1978 Arthur Conan Doyle Medal by the Monnaie de Paris(https://fourthgarrideb.com/2018/12/01/the-1978-arthur-conan-doyle-medal-by-the-monnaie-de-paris/)