Dąbrowski has an unidentified “Masonic Symbols”, see below. It looks somewhat alchemical. Perhaps it is from the Gold- und Rosenkreuzer or some similar group. I don’t know in which degree this image is featured and if there are other systems or degrees with this symbol. The placement on the image below makes it unlikely that it has the same meaning that the caduceus in some lodges has.
I also ran into a contemporary French 28th degree AAS tracing board which has two snakes encircling a cross.
Also see: two serpents and a cross, caduceus and Virgo Immaculata.
Collection complète des tous les grades connus dans l’Art Royal de la Franmaçonerie (sic) à Edimbourg 5780