Hi John
All the pieces are marked in the same way. As the decoration is in gold, I wondered whether the K9 stood for 9 carat.
After complaining that Kosta Boda didn't reply, I've just got an email from the USA apologising that they can't help, but saying that the Swedish factory is closed for the whole of August and that they will contact me after then! However, they did suggest that the designer might be Kjell Engman - so I'm going to check on the web for any info about him
Joan