For the first eight emissions, when Officina marks are used, the Officina are identified with I, II, III and IIII in exergue.

For the ninth emission, the Officina are identified with A, B, C and D in either the left or right fields.This emission also uses retrograde versions of the marks for Officina B, C and D. There is an exception to this, where in one example the Officina mark appears in the exergue.