Hmmm... Naga pieces are also found in Northern Peninsular (see pic) and Riau-Lingga Archipelago, (an example in Asian Civilizations Museum, Singapore). There are quite a number in Sumatra as well.
Although I believe it originated from Java and found its way to other regions.
@quotes from Dave Henkel's site
There are a surprising variety of Peninsular forms although there is little information about the dapur or shape of the blade. Take a look at this interesting naga blade. (Pattani, Southern Thailand... anonymous collector.)
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