Alan,
 I am very grateful that you posted this beautiful example of Javanese metalwork. It is exquisitely executed and of a very high standard. It appears virtually flawless. The 
pendok reminds me of bas relief carving, with a 3-D appearance based on subtle layering of the objects. 
On a similar note, I am delighted with the item that I purchased from you recently that also has excellent silver work. 
 
 
These works of art are national treasures.