If you are interested in Livonian coin, as a general rule, avoid anything minted before 1575. During that year, the mint in Riga got a machine called the Walzerk, which basically worked by placing a sheet of metal through a machine that was like two rolling pins (which had the dies on them). Someone/something would then punch out the resulting patterns. With a process like that, it is not rare for coins to be off-struck, and when the coins are off-stuck, you will not see an empty space outside the main pattern, but rather the beginning of another pattern.
So, looking at the Livonian places who struck their coins after 1575 more specifically...
For the Free City of Riga, this type should be the only non-hand-struck one (which also happens to be the most common type):
https://en.numista.com/catalogue/pieces42146.html.
For the
Duchy of Livonia, anything under the Thaler currency should be good, although I cannot confirm the gold coins were struck the same way. Under the mark currency, the coins were all struck at Dole Castle, and would have been struck by hand.
For
Swedish Livonia, anything from 1 Solidus to 3 Polker should be good. As like above, I cannot confirm the gold coins were struck the same way, and I also cannot confirm that with the thalers. And under the Siege of Riga, the countermarks would have been added by hand, so I guess those should be avoided.
And that just leaves the
Duchy of Courland. Their coins were minted at Mitau, but their off-struck coins do not show the design meant for another piece (for example:
https://en.numista.com/catalogue/pieces87572.html). Because of that, they would not have use the Walzerk, but the fact that there are some majorly off-struck coins makes me think these coins were either not hammered, or that the striker was extremely lazy. So... I am not sure about this place.