Postage stamps and postal history of Allenstein
In 1920 a
M
.
The plebiscite was held on 11 July, and produced 362,209 votes (97.8%) for East Prussia and 7,980 votes (2.2%) for Poland. The stamps became invalid on 20 August. Despite the short period of use, almost all of the stamps are cheaply available both used and unused.
After the
Second World War, on 2 August 1945, the city became part of Poland under terms of the Potsdam Agreement) and officially renamed as Olsztyn
.
