Kai- thanks very much for your thorough metallurgical assessment and your gut-feel on age estimate!
Interestingly, you're the second person to posit that it may be a "revival" blade; a good friend of mine who's a museum curator had the same view. Compared to other archaic krises I've encountered- this kris has a pretty solid and non-flexible blade. It also has heft, unlike archaic krises which are usually light (sometimes ridiculously so).
I agree with your quench-line theory- that would explain why a bit of pattern in one of the sides still managed to spill over the line.
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