Yes David, I agree with you, this is definitely not a keris that would fit into Majapahit parameters, the main thing that excludes it from a Mojo classification is that the blumbangan is square, this is a Mataram indicator, specific as well as generic.
It might be worth remembering that Javanese blades were traded & shipped all over SE Asia from Majapahit times through into at least the 18th century, & possibly later. They were even shipped to Sri Lanka and Southern India.
It is not at all unusual to find a Javanese blade of any style in dress from a place other than Jawa.
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