Maria Theresa Thaler Redux

This is one I acquired some time ago now (it was part of an older collection), and had actually shown here before. I'd like to get another take on it based on fresh photos and physical data.

I've weighed it this time around with a carefully calibrated scale, and get 28.00 grams exactly. It's irregular in diameter, measuring 39.8 mm in the vertical dimension and 40.3 mm horizontally.

The key visual characteristic is that the flan was evidently a bit undersized vis-à-vis the dies. This makes it, then, either an H58 (Vienna), or with a much lower probability an H71 (Rome)?