1950's Air Mail from Finland to Great Britain

Air mail postcard from the Littoinen village (near Turku) to London, Great Britain sent on 12.8.1950. Postcard rate to Great Britain was 12 marks between 1.11.1949 and 31.12.1951. Air mail surcharge of postcards to Great Britain was three marks between 24.10.1945 and 30.9.1957. The postcard below has a correct rate for an air mail postcard from Finland to Great Britain. 

Air mail postcard (Christmas greeting card) from Turku to London, Great Britain sent on 24.12.1953. This postcard was sent with a "Printed matter" rate and an additional air mail surcharge for speedy delivery.  Printed matter rate was 10 marks between 1.1.1952 and 31.7.1958. Air mail surcharge for printed matter was five marks between 1.7.1953 and 30.9.1957. Correct rate. The single use of this M1930 definitive stamp on a postcard to abroad between 1952 and 1956 is not a common occurrence.

The postcard's picture side has a severe printing error as there are major colour offsetting clearly visible on the card.