I'm stumped by this mark - Please Help!

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I have a black and white sterling enamel brooch, marked 925S, with pink enamel roses in the center that I am trying to identify the maker of.
Below is a picture of the mark. Any help is appreciated!

[dragonflywink]

Oslo maker Thorleif Johnsen, should date from 1916-36...

~Cheryl

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Thank you!