The section is in the stage of constant replenishment. I would be grateful for the sent scans and information.
This section does not claim to be complete and comprehensive, it was created to clearly show the variety of philatelic materials on the topic and become a pleasant addition for philatelists-thematic who do not limit their collection only to postage stamps.
Special postmarks
Special postmarks are a collective name for various postmarks that, in addition to standard elements (dates and places of cancellation), have an original drawing and additional commemorative text. Such stamps are made for a specific occasion (anniversary, memorable event, etc.) and have a limited period of use.
Separately, it is worth noting the First Day postmarks, which are developed specifically for new series of postage stamps and are used on the first day of their issue. Many postmarks contain an additional inscription: "First day" in the national language.
The term or "Pictorial postmarks / cancellation" can also be used
Pictorial (Illustrated) calendar postmarks
A modern calendar rubber stamp is usually a round stamp with a built-in numerator that allows you to change the calendar date on a daily basis. Standard calendar stamps with a change date are used in the vast majority of ordinary post offices. The main task of such a stamp is to fix the date and place of receipt of postal correspondence.
However, some post offices use illustrated calendar stamps that include the original illustration in addition to the date and location. The picture, as a rule, reflects the characteristics of the region or the given post office. Most of these stamps are permanent or have a long term of use.
In the same category, I included illustrated permanent postmark issued for a specific reason, despite the fact that formally they can be attributed to special postmarks. It seems to me that in essence they are closer to conventional calendar stamps due to the long term of use.
Permanent pictorial cancellations are very popular in Asia, especially Japan and Korea.