Found this. It is 21.3mm and weighs 2.61 grams. Has busts of Napoleon and Louisa. The reverse shows the standing couple with the legend "NAPOLEON IMP. ET ROI - ? LOUISA MATR ?" Napoleon divorced Josephine and married Louisa in 1810. Suspect this to me a medallet honoring that marriage.
My rookie research that medals commemorating this marriage were struck in gold and silver, these were given out to attendees of the wedding. There were also smaller ones struck likely in base metals that were given to the masses.
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