Hello,
Following Xavier's post on mints, here is a try:
I would be very happy to have the table called "Österreichische Münzprägeanstalten" from this wiki https://de.wikipedia.org/wiki/M%C3%BCnzpr%C3%A4geanstalt
tranferred into the mint lists and letters.
Forget about the lst 2 in the table, they are images (shields) needed for some 100/500 silver shilling coins. Not many, for Vienna and hall.
I imagine it will be a bit experimental. Some letters change mint with time, some mints have several letters depending on the period (ex Vienna, A, W or WI).
It also includes some crossings with Hungary, Bohemia, etc.
Have fun