Working dha..with makers mark..two cirlcles
 

http://i154.photobucket.com/albums/s...6_edited-1.jpg

http://i154.photobucket.com/albums/s...a/DSC_0047.jpg

http://i154.photobucket.com/albums/s...a/DSC_0048.jpg

http://i154.photobucket.com/albums/s...a/DSC_0049.jpg

http://i154.photobucket.com/albums/s...a/DSC_0051.jpg

http://i154.photobucket.com/albums/s...a/DSC_0052.jpg

http://i154.photobucket.com/albums/s...a/DSC_0054.jpg

http://i154.photobucket.com/albums/s...a/DSC_0056.jpg

http://i154.photobucket.com/albums/s...a/DSC_0057.jpg

ANOTHER
 

Another with the same marks. This one believed to be of SHAN origins. Yours appears to be MAYBE of KACHIN origin due to clipped blade. Mark--your comments??
regards Stuart

Definitely not Kachin. Shan/Tai, probably from Thailand.

I agree. The initial assumption that a square/concave tip mean Kachin has not held up. I have seen a couple with the double circle mark, which I think represants a flower. I have seen a few more with a single circle. The meaning of the marks I have no idea about, though I am assuming that they are maker's marks. They seem to occur on dha from northern Thailand (e.g., Chiang Mai), however.

Here are two circles combined with a turtle; note the stylized foliage extending from the right-hand one
http://www.dharesearch.bowditch.us/49_full.jpg
http://www.dharesearch.bowditch.us/49_markings.jpg
Here is one that was filled with resin
http://www.dharesearch.bowditch.us/Images/Image247.jpg
http://www.dharesearch.bowditch.us/Images/Image248.jpg
Another single divided like a pie, made with a single punch it seems
http://www.dharesearch.bowditch.us/Images/Image215.jpg
http://www.dharesearch.bowditch.us/Images/Image217.jpg