Hi I looked this up online and got down to the following info: 1853-today; mostly Vienna mint; few in Birmingham, Brussels, Paris, and Rome. Could someone please help me with a more specific attribution? Thanks.
They have been re striking these for 100's of years. And most likely it would be difficult to nail down when each one was re struck. Hopefully someone has a good reference for you to search the die markers.
This is a good quick guide (which you may have used already to figure out the 1863-date part): http://www.theresia.name/en/svariants.html