Digging up this thread again.
At this moment I have 3 cojangs/rudus with hulu cangge gliwang
One of them has been dated thanks to Zifir.
I have the feeling that the simple hulu cannge gliwang on the left/bottom of the following pictures is even older.
No rational reasons, just because it is more simple, different in shape and dirtier/more patina
Are there forumites with similar hulu shapes and any age indications on them ?