Seeking Information on Keris

[elsquibble]

I've got another couple of photos looking down from above, apologies for the delay I've been very busy. I do think it's straight the whole way down though which is unfortunate.

Does anyone have the faintest idea of why this might have been done? Could it be a repair of a blade with a chip or something? More likely someone thinking they can make it more valuable if it's wavey.