Nice! I'm still looking for other unusual overstruck copper coins, that is an overstruck 2para-3kopeks coin, which I guess will prove to be very difficult. The Swedish overstruck 1 ore itself is quite interesting and I don't think I'll see another sample any day soon:

One other thing that I am hunting for is to look for three different years on a single coin, which I think will prove to be real challenge. I only have one so far that has clear dates.

(thanks Banivechi)
And another two different overstruck coins for your eyes:


Gives you totally unusual look of the coins.
(as well as, I'm looking for an overstruck 1724 kopek - serves me right for not buying one a long time ago

)