Finnish Stitch 1+2, plaited edge  (Rindal Stitch)

Hansen's Notation UOO/UUOU F1  (video)

FS 1+2 plaited edge, Rindal Stitch 

Rindal, Ålvundeid, Støren (Norway)

Nordland mentions in his book a pair of mittens made with this stitch from Rindal and Ålvundeid (both places from Møre og Romsdalista, Norway), and from Støren (from Sør-Trøndelag, Norway).

Finnish Stitch 1+2, plaited edge, F1
Rindal Stitch

front side

Finnish Stitch 1+2, plaited edge, F1
Rindal Stitch

reverse side

1 thumb loop, 2 loops onto the needle behind the thumb. At the end push the needle under the thumb loop, but over the needle yarn.