Brass bits on a Jamdhar Katari

[kai]

I don't see any signs of cross hatching used in koftgari.

If koftgari, I doubt you would be able to still see the cross hatching in such a corroded condition.

If you really were to restore this (close) to working order rather than keeping it in relic condition, I'd either choose "sandblasting" (with softer beads than sand), electrolytic rust removal (http://www.vikingsword.com/vb/showthread.php?t=1174), or the pineapple juice approach (search the keris forum). All have pros and cons, so take your time for reaching any decision.

Regards,
Kai