When I brought my first one I had no idea what it was, nor did the person I brought it from. When I found out about them I became hooked, partly, because for the times they were so well engraved, and struck, and because as there was only 13 in the series, it was a set I could hope to complete. You can still find them "unknown". See picture below from Ebay, spot the Duchess of Gloucester Sentimental Token still with lustre. I purchased the collection of odds & ends for the minimum bid (2 or 3 dollars a year or so ago) just for that medal. Nobody else spotted it
Click to view attachmentHope this below helps.
Some Selected Reports from the Bath Journal Monday, March 29th, 1773 :
The Sentimental Magazine
A NEW MAGAZINE, With every Number of which will be given a curious MEDAL, struck on fine Metal, about the Size and Weight of a Guinea, executed by Mr. KIRKE, who is universally esteemed the First Artist in London in his Profession. This Medal will of itself, exclusive of the Magazine, be Worth at least Half-a-Crown; it will represent some reigning Toast, some Great Personage, some Hero celebrated in the Annals of our own Kingdom, or in those of the Continent, some Patriot, or some uncommon literary Genius.
On Thursday the First of April will be Published, Price Six-Pence, In which will be given an elegant Medal of his Majesty George III. the Dye of which is executed by Mr. Kirke, and esteemed a most Striking Likeness; and also embellished with Copper-Plates, designed and engraved by the best Masters NUMBER I. [to be continued Monthly] of The SENTIMENTAL MAGAZINE Or, GENERAL ASSEMBLAGE of SCIENCE, TASTE and ENTERTAINMENT.
Calculated to amuse the Mind, to improve the Understanding, and to amend the Heart. London: Printed for the Authors, and sold by G. KEARSLEY, removed from Ludgate-street to No. 46 in Fleet-street, and by all other Booksellers in Great Britain and Ireland. *** The MEDAL to be given with each Number will be sealed up in a Kind of silky Paper, provided for that Purpose, to prevent any Injury to the fine Impression of the Dye; and it will be so affixed to the Magazine, as to render it portable with it without any Inconvenience. Those Persons who are desirous of having any of the Medals given in the Course of this Work, struck in Gold, Silver, &c. may, by applying to the Publisher, be supplied with them on the most reasonable Terms.
During the magazine’s short five-year life span it did report both domestic and foreign news, births, marriages,deaths, letters to the editor,bankruptcies, and poetic essays. However, over time it developed strong editorial sympathy and support of the American Colonies’ struggle for independence. By embracing, what for many in England was an unpopular cause; it experienced a steady decline in readership. The “Sentimental” continued to be published until December 1777 when it disappeared from the journalistic world, leaving only the thirteen medalets to mark its existence.