Okay i have had these bowls for about 5 years now. I have tried to find out the mark for about 3 of those years, and gave up. I don't expect anyone to know the mark.....it is a mystery....it is a Chinese mark i think. I am not posting to find out the mark, but maybe someone can tell me about technique and maybe be able to help me with a time frame based on technique...
These bowls seems to be hand made to me...none of them (4) are exactly the same, and none of them are perfectly round. If turn them over and lay the tops on a flat surface you can see that they are not perfectly round:
Any info would be awesome!! here are some pics: