Bali Keris, original stain and other comments

[asomotif]

Hello folks,

I managed to pick up this Bali keris pure on esthetics and personal taste.
Now I would like to check a few things.

- It looks original stain to me. am I right ?

- there are some markings on the ganja. the seem deliberate to me.
Do they have a meaning or purpose.

- Is there any indication on age ?

Thanks for any input,

Best regards,
Willem