A very nice Sikin.
I have had it in my hands last month when it was still in the Netherlands.
The blade is quite common, as far as Siking Pasangangs of this quality are common
The silver can be cleaned, it will get darker by time again.
But I would also choose to leave them as it is.
I Have no experience in etching, but from previous posts by Bill we can see that this is in goods hands
enclosed a picture of a sikin with similar bladepoint.