Sraits(?), Malay(?), need your opinion

[Sajen]

Hello dear members,

I was able to add the pictured keris recently to my collection. I am a little bit unsure about its origin. I strongly guess that it is a Straits keris but it could also be a Malay keris. Handle in Malay Jawa Deman form, strong 7 luk blade.
Another question, would you etch the blade or would you let it in this state?
45 cm inside scabbard, 43 cm without, blade with gonjo 35,5 cm.

Thank you in advance, I am curious to read your comments.