Piedmont - Subalpine Gaul 5 Francs

Piedmont Republic was established by Napoleon Bonaparte in 1798. By 1799 Austria and Russian forces overthrew the republic. Date is AN 10 which equates to 1801, I do not know the reason for the incongruity of the date. Obverse legend is GAULE SUBALPINE The instrument shown being held by the allegorical figure of Libertas is a masons level and was also used as an angle measurement tool. It's a prominent symbol used during the French Revolution. The other female figure with Libertas is Aequitas. These were struck in AN9 & AN10. The Heart symbol is the mark of mintmaster Vittorio Modesto Paroletti at the mint in Turin Italy with 33k struck. The edge is engrailed with a leaf like pattern around. I'm still mystified on the exact relavance of ERIDANIA, most references indicate this a a female name but it must relate to the Piedmont area. Any help would be appreciated.