A single line description of the piece would be,
Keris Malela Terengganu, Luk 5, Miang Perak...
Imho,
besi malela when mixed with
miang perak, weakens the structure of the blade. With the architecture of the malela's fullers, the blade strength weakens. You'll still get a lightweight blade... but.
Although unique, this is not a common practice for malela blade, afaik.
For malela blades, the metal is more 'compacted', thus enhancing its strength. Newer pieces tend to be nicely sculpted but the material, less compact.