Thanks Ian.
There are a couple of different shaped blumbangans:- boto adeg, boto rubuh = standing brick, brick laying down. Then there is the square blumbangan and extreme examples of the two brick types.
The form of the blumbangan is primary indicator.
This keris has some indicators that point to Madura, but I would expect a squarish blumbangan in a Madura keris, this blumbangan tends to the lazy brick, laying down, having a rest. That in turn suggests West Jawa.
I cannot recall ever having seen an older Maduro keris with a brick laying down blumbangan. This doesn't mean that there could not be one, it just means I cannot recall having seen one.
In any case, whether the blade was made somewhere in West Jawa, ie, Sunda, or whether it was made in Maduro for sale in West Jawa, I do not feel inclined to guess. But I will guess that this blade is not 20th century.
Of course, in the hand opinions can always change
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