|see below †||xxx|
|Stamps of Hungary overprinted †|
|not found||not found|
The Scott Stamp Atlas  states that,
"According to the Trianon Agreement, a plebiscite in 1921 was to decide on the adherence of Western Hungary (Burgenland) to Hungary or Austria. Hungarian rebels prevented the holding of the plebiscite and occupied the whole territory. In the end, Sopron and its environs remained in Hungary.
In 1921 Hungarian stamps with various overprints such as 'NYUGAT-MAGYARORSZAG', 'LAJTABANSAG' and 'WESTUNGARN ORGLAND' appeared followed by definitive issues: a total of 85 stamps. Equally doubtful is a 1956 issue when, during the events in Hungary in October, Hungarian stamps were given the overprint 'SOPRON'. The authority for issuing the stamps is unclear and their postal validity has not been proved."
† The three 1921 overprint texts are listed in Linn's Stamp Identifier  but each with comments such as "Westen Hungary, unrecognised" and "not listed in Scott".
The stamps have not been found in Scott or Gibbons, but they are readily available on the internet, the examples shown being from Stampworld.com.