Hello numista!
I believe I have found a swedish 25 öre from 1947 without a mint mark, however I am very new to collecting and therefore would love some experienced input!
The mint mark TS should be found below the year. Here are two close-ups of the coin with light source from left and right.
Google has provided no information regarding this being a known variety. The coin is far from UNC, which naturally makes wear a possibility.
However no other detail (including, crucially, in the vicinity where the mint mark should be) is worn down to the point where it has completely vanished. Additionally the numista-page mentions a 1944 variety without a mint mark.









