Leslie Pina says that Skruf, a company in Smaland, Sweden, became part of the Royal Krona Group that went bankrupt in 1977. But I keep finding things with a Skruf label that were obviously made after then so I think they're still going. Their main designer for a long time was Bengt Edenfalk. This doesn't look like an Edenfalk. I have read somewhere that Bo Bergstrom, usually associated with Aseda, designed for Skruf when both companies were part of Royal Krona. I wonder if this is one of his. That would make it early to mid 70's.