Pedang.....Mataram blade?

[Jim McDougall]

I need some help from the experts on describing this pedang properly.
As I have VERY little knowledge in this area, plz bear with me.
It has been suggested the blade is very old......Mataram?
But this seems impossible as Mataram period is virtually ancient.

Can more be said on the pamor (an extremely complex matter from what I have read in discussions here)?
Can the lighter areas suggest nickel/meteoric content as noted in various references? I only find reference to one meteor 'event' in these areas long ago....can that material have supplied this blade industry over all this time?

The dress seems to be teak? or perhaps kayu sono.

It is a pedang 'sabet' (=slashing sword?).

Trying to figure the time frame on clearly modern dress, and how to describe the interesting pommel feature.

If I understand correctly (again limited understanding) blades, especially keris, were often remounted over generations, especially if a blade is a sacred heirloom (which most must have been) and termed 'Tosan Aji'?