The reason I came up with letterpress made QSL cards, Peter, was of course that you have one. Also Aaron Parecki is interested. Not only is he deeply involved in Webmention as a standard, he also has a ham radio license (W7APK) like me (PE1NOR). So we have at least an audience of 4 😀
Bonus pic: the QSL cards I sent when I didn’t have my license yet (I got it in ’89) and sent out listening reports to both sides of successful connections (QSO). These were often highly appreciated by the stations involved as sometimes the only proof they had that a conversation with some exotic station had taken place was that someone overheard it and sent a report. [Added: the QSL card below mentions DP0SL, which, while a German callsign was definitely an ‘exotic’ station. DP0SL was the call sign of the D1 German Space Lab mission, hence ‘SL’.)
These QSL cards were bundled nationally and then sent as packages to the ham radio club of the destination country, where they would be disseminated through the various regional ham radio clubs. I should have a stack somewhere of QSL cards I received from all over the world.
And here’s an example of the logs I kept as a teenager, exactly 34 years ago: