The study concerns itself with Old Helsinki Slang (OHS), a peculiar speech variety (spoken approximately between 1890 and 1950), mixing Finnish morpho-syntax and Swedish vocabulary. It is claimed that it resembles intertwined mixed languages. The study focuses on the lexical, phonological, morphological and syntactical features which are most likely contact-based. Besides the vocabulary, the impact of Swedish is clearly seen in phonology, while in morpho-syntax differences from Finnish are minor. In the conclusion, OHS is compared with Media Lengua and Ma'á. Although OHS was never an independent or an established system, it has a particular value as an example of language mixing in an exceptionally well-documented urban environment, even though the process was interrupted, and OHS gradually merged with Finnish.
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