Wolfgang Baldus is a German graphic designer, artist, and philatelic writer. He is known for authoring and publishing books on cinderella stamps in the series History and Background Stories of Unusual Stamps and for his works on the philatelic forgeries and propaganda parodies produced by both sides during the First and Second World Wars.

A local post is a mail service that operates only within a limited geographical area, typically a city or a single transportation route. Historically, some local posts have been operated by governments, while others, known as private local posts have been for-profit companies. Today, many stamp collectors operate hobbyists' local posts, issuing their own postal stamps known as "locals" or "cinderellas" for other collectors but rarely carrying any mail.