In Austrian assay offices after 1867 letter H was assigned to Bregenz (from 1872)
Bolzano (Bozen) had number 2 beside H, e.g. H2.
Later, (year unknown), Bolzano (Bozen) had its own assay office with letter I , both in ``Dog head`` and I in a rectangle.
Cannot recall if this fact has been mentioned elsewhere.