Finnish Stitch 3+3 (Sortavala Stitch)
Sortavala (Ladoga Carelia, former Finland; area belongs to Russia since 1940)
Kannas (Carelian Isthmus, former Finland; area belongs to Russia since 1940)
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|Finnish Stitch 3+3 (Sortavala Stitch)
You can read more about the Finnish Stitch Family on page Stitch Grouping by Toini-Inkeri Kaukonen (link).
Kaukonen writes (1960) this stitch type FS 3+3 was used in Finland for thicker mittens, but doesn't name places. Combining the information from Kaukonen's article (1960), and the samples in the NBA ethnological collection (label 9170:6, FS 3+3 F2) , you can see, though, that Ms Elmi Tsokkinen from Suojärvi learnt this way of nalbinding from a woman in Sortavala.