The cover shown in the attachment below prompted me to wonder when civil censorship ended in Finland.
Ari Muhonen reports that "Finland continued censorship measures until Dec 31, 1946, but only some 15% of mail to abroad was inspected. The percentage was a lot smaller for the incoming mail."
My new question, given that Finland was still technically at war with the USSR and the UK, et al., until signature of the Treaty of Paris on February 10, 1947, is: Why December, 31, 1946 rather than some time in the summer of 1946 when the treaty was negotiated, or following its signature?