This is Finnish made telephone, from OY Puhelinteollisuus (Telephonefactory) in Helsinki.
Phone made from steel and bakelite.
Phone may be done during 1950's.
O/Y Puhelinteollisuus was founded 20.09.1940 and name changed to Standard Electric Puhelinteollisuus OY 19.04.1962. Name changed again 19.06.1991 to Algatel Suomi OY and closed 31.05.2007 and closed 31.05.2007.