Model 'D-4', from the 'Pohjanlahti' series.
Knotted wool pile.
More information:
Textile engineer Betsy Wegelius developed the semi-industrial technology. The Pohjanlahti series comprises 12 models manufactured in limited editions in the early 1960s.
Literature:
Sarpaneva, Timo & Kalin, Kaj, Sarpaneva, Otava, (Helsinki), 1986, pp. 184-193.
Ref: 2505059