@_thegeoff @plwt @Thayer Tangentially relatedly, Poland's post services were being demonopolized in 00's. They started by removing the Polish Post's law-given monopoly for "letters above 50g" IIRC. Thus we ended up with lots of companies sending out letters with a 50g weight (usually a sheet of aluminium) attached to them.

(I don't think that this ridicules the Post that much, as TTBOMK they had more stringent requirements to serve everyone than new competitors.)

E: The weights themselves: https://www.olx.pl/antyki-i-kolekcje/kolekcje/pozostale/q-inpost-blaszka/