Biggest Collection Of Square Coins?

I've heard that Livonian coins from the 17th century were produced with a similar method despite being round. Is that true, and if so, could one have got clipped?
I'm asking because one of mine* has a slight misalignment that puts on the coin a piece of beaded border that appears to belong on another coin (similar to misaligned print on banknotes) - which suggests a coining method similar to the one described - and appears to have a clip almost exactly opposite that piece (unfortunately, the usual signs of a clip as opposed to damage would've been hard to see on such an old coin, and for that matter if the clipping happened during the process of cutting the coins out from the strip we might well have no way to tell anyway - but until I see evidence to the contrary I would personally assume it's clipped).

*) funnily, I bought it for Secret Santa, but later found out it's illegal to send and decided not to take the risk

They're middle 17th century (that particular one was 1654 IIRC... could've been 1652 or 1651, don't remember exactly) and relatively tiny (you know what a solidus is right? sorry I didn't mention it in the original post).
In fact, I'm not actually sure that's the reason; I just heard somewhere that they were minted that way.