@DonnaML yours if from the Paris mint (A), while @Mat's is from Rouen mint (B) The lyre you mention is the master engraver's symbol, François Bernier at Paris mint (1774-1793), while the scallop shell is that of Jean-Jacques Claude-Jacques at Rouen mint (1784-1794). Also of interest, on the obverse of your coin, above the date you see a leopard, mark of the director of the mint, Alexandre-Louis Röettiers de Montaleau (1791-1793), and on Mat's a Pascal lamb, mark of director Joseph Lambert (1786-1794) Q
This reminds me when in garage sales I was hunting old solid silver tea spoons (or bigger forks, spoons, etc.). Now it's over, these items have vanished, but in the 1990s there were sometimes interesting discoveries. I looked for old silver hallmarks, like this one for ex: The rooster looking backwards with the numeral 1 : spoon dated 1798-1808, 95% silver. We have now a full box of these old 19th c. silverware items, and we use them quite often.
...seems the 1/5's, such as yours, are usually in much better condition...i am going for a 1/5 of Louis XVI now
Is it something like that you're looking for ? Louis XVI (1774-1792) - Cinquième d'Ecu aux lauriers 1784 A (Paris) LUD . XVI . D . G . FR . ET . NAV . REX ., buste habillé a gauche orné du cordon du Saint Esprit. Héron sous le buste SIT NOMEN DOMINI BENEDICTVM lyre 1784, ecu ovale couronné entre deux branches de laurier, A sous l'ecu Tranche cordonnée 5,86 gr - 26,5 mm Ref : Ciani # 2190 Q