In 1919, on the initiative of the Olonets Temporary Organizational Council and with the consent of the Finnish authorities, eight post stamps were issued for Olonets Karelia by overprinting the word “Aunus” (“Olonets Karelia”) over the ordinary Finnish post stamps. The original post stamps were the so-called "Saarinen’s model" or the first stamps of independent Finland, designed by the architect Eliel Saarinen.

The post stamps were valid in the Olonets Karelia and were also used for the postal items addressed to Finland.

Post stamps of Olonets Karelia with the denominations of 5 and 10 marks are really rare due to the small print run.