Here are photos of some ballots I recently found in storage.
The first is from the 1997 Liberian general election. I think it is a ballot from the presidential race, which technically happens under two-round runoff (but did not matter in this case).
The next is from Ghana (presidential), 1996. Again, the rules seem to have been two-round, but a runoff did not happen.
Our third is from Iraq, probably in 2005, and is translated to have come from elections to the Kirkuk Provincial Council. The electoral system appears to be closed-list PR.
The next ballot is from a Kosovo Municipal Assembly election, year 2000. It suggests a list-PR system allowing for preference votes. Note the option on the left to vote for a party list, then the option on the right to vote for a candidate by entering an ID number. The description I just gave is consistent with a range of open- or flexible-list rules. Wikipedia does not say what the rules were. The OSCE provides detailed results.
The last thing I found is not a ballot but instead a blank petition from the signature drive that produced the 2018 People’s Veto referendum in Maine. That re-legalized the Alternative Vote for state and federal elections, although eventual implementation was for party primaries and congressional general elections.