elli - the first mark is the mark for Saxbo
Martin - Thanks for that. Danish, eh? Doesn't look much like the Saxbo I can find online, however...
Diane - The second mark looks very like Ai Oi Hoon
Martin - Thanks Diane, that Sounds like a possibility. Can't find much info on Ai Oi Hoon... Any more info or pointers you could give?
Jo - First mark looks like the Ying and Yang symbol. The second is like a Chinese chop mark but possibly designed by a western potter. I'm sure the Y-Yang mark is in the pottery book somewhere!