My AV Stater from Senones/Carnu tes a Celtic peoples in NW France circa 50BC-? Weird shape, not very pretty....
Obsolete US/Canada banknotes for now. However, I am seriously thinking of getting into Imperial Roman Silver coinage, so much more affordable, even in FDC. Always liked prestine quality Silver Thalers from German States/Holy Roman Empire. I really like hammered gold/ also early dated Christian coinage.
I wish you the best of luck with that. I am currently mostly working in bronze. I do pick up silver, but I am picky because of the cost. @Zohar444 has some amazing German stuff that you should check out on his Taler Universe site.