Opinions: large keris w/ intricate inlay

[another_rick]

Hi all. New here and looking for advice/opinions on my keris. I inherited this from my father several years ago, and despite much research, I cannot find any published examples that are truly comparable - particularly the inlay. I'm hoping someone here has some insight. If nothing else, I hope you all find this half as fascinating as I have.

Details:
1) Luk-11, blade-only (no ukiran, waranga, etc.)
2) Weight: 1,023 g
3) Length: 57.3 cm (not including pesi)
4) Blade Width: 5.4 cm at luk-1, tapering to 4.6 cm at luk-11
5) Blade Thickness: 0.60 cm at luk-1, tapering to 0.44 cm at luk-11
6) Ganja Width: 15.8 cm
7) Ganja Thickness: 1.60 cm (at center)
8) Inlay: Both sides of the blade contain the same, intricate inlay (kinitah?) that extends from ganja to tip. Inlay material is almost entirely present, but the few voids present reveal deeply cut channels (~1.5 mm).

I believe this to be from central Java, possibly late 18th century, but that's I brave to speculate at this point. Any info or questions are welcome.
(Note: Final photo a sketch-over, intending to show the full inlay design clearly.)

Thank you,
another_rick