I'm not sure, but I think this is by one of the Wirkkalas, possibly Tauno, whose designs I actually prefer to his more famous brother's. May be part of a series called Kruunu, or Crown. Definitely a Humppila production.
Brun skål fra Humppila, Finland. Design av Pertti Santalahti i 1970-talet. Brugt men i godt form 150 kr Kan sendes eller hentes fra Trondheim