ho can tel me what type of keris this is

[A. G. Maisey]

Well, I really and truly do not like doing this sort of thing from photos, but for once I'm going to throw my hat into the ring and play the guessing game.

Why?

Because I've seen a pretty fair number of blades that look pretty much like this one, and they were all in South Sumatra dress, that is, Palembang and similar.

So my guess is South Sumatra, second half 19th century.