Dragon jar? Martaban?

This jar is so very unusual! I have had it for a few years as it came with bamboo from an estate sale. It is incised under the glaze, has two dragons all the way around the width till they meet in the middle by a cloud? And a pearl. It is very very heavy. And the most unusual is that I never saw a face in this piece UNTIL after I took a picture of it. You can only see them in pictures. Very interesting indeed. I thought maybe a burial jar from a longhouse in Borneo? I don’t know. I read so much i think i confuse myself. Any help at all on this would be greatly appreciated!