This is actually a pretty good question Martin --- I think of "good questions" as ones that I need to think about before I can respond to, and although I could have given a quick, off-the-cuff response to this question, I've been thinking about how best I should respond. I think I might now be able to do so.
In Jawa, when we refer to the angle of a keris blade, we refer to that as the "condong campur" of the blade.
"condong campur" applied to the keris & in Bahasa Indonesia can be understood as a "confused angle", actual translation is campur = mixed/confused, condong = leaning; used in Basa Jawa context the understanding is similar but the actual translation is campur = to mix, condhong = in agreement with.
So the blade angle in this keris is bit too "condong campur".
Now, in the Surakarta Pakem, there is a straight keris that is Dhapur Condhong Campur. It has not been drawn with an extreme blade angle, the only remarkable thing about it is that it has sogokan for the full length of the blade. There is also a waved keris that is given as Condhong Campur.
So there you have an explanation of how we would think of this keris in Jawa, but it still does not give you a dhapur name for it, and in my opinion, the blade is far too worn for us to be able to determine exactly how it looked when new.
Footnote: in fact the practical application of this extreme angle is an attempt at an ergonomic application, the angle moves the blade point to a position more favourable to centering on an opponent's body. Now that doesn't matter much today, but it might have provided some slight advantage when keris were used to end life.
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