Very nice Kai Wee. I have a keris with very similar dress (it doesn't have the black bands) which i always assumed was also early 20thC, so your dating helps support that, thanks.
Do you think these two were actually made as a pair or they just happen to match. The one difference i do notice right away is that the badek lacks the black bands (horn?ebony?) that are present at the top of the gandar on the keris. They look good together regardless.