The four types of postmarks
Most Post Offices have a standard postmark with the name of the Post Office, postcode and date, but there are also four postmark types exclusively produced for specific stamp releases or events.
National First Day of Issue
Used to commemorate the release of a new stamp on a national level. The locality name is chosen for its link to the stamp issue.
Reflecting something distinctive to the locality, such as penguins for the town of Penguin in Tasmania or a lighthouse if one is prominent in the area.
These postmarks are used on either single days or consecutive days commemorating a special event.
Postmarks associated with a historical or geographical reflection of the local area but not necessarily pictorial and can be used to cancel first day of issue stamps only.