Postby blakstone » Wed Mar 14, 2012 9:10 pm
These marks were introduced in the Napoleonic Kingdom of Italy by a decree of Eugène Bonaparte on Christmas Day, 1810. He mandated two silver standards, identical to those in France: the first of .950 and the second of .800. The “mondo stellato” was the second standard mark for large items, and the “anvil” for small ones. They began use on 1 Mar 1812, when the first new Italian assay offices were opened, including that in Padua [Padova], whose identifying mark, as stated, was the serpent & basket (shown in your photo on its side).
After the fall of Napoleon, these marks continued to be used in those parts of Italy which became the Hapsburg Kingdom of Lombardy-Venetia (including Padua). They remained in use there until the unification of Italy, the Padua office closing in February 1870.
So unfortunately, that gives a rather broad date of 1812 to 1870 based on the marks. Stylistically, though, I agree that it looks very much the earlier end; I would say 1820 or so.