Philippine monosteel Blades. Preserving and restoring

[oldschldude]

Hello Everyone,
I would like to ask what is monosteel(Philippine monosteel blades)? What's its history? Made of? Automobile coil? Leafspring? Can you age the blade if its monosteel construction? How do you get rid of rust on monosteel blade? Does the same rust removal techniques for laminated blades apply? Polishing and etching? Would you apply vinegar or other etching acids(citric acids or Fecl) to a rusty monosteel blade? Thanks! Oldschldude

Blade dark spot early rust.
Slightly surface rust.
Pitted rust spots.
Crusty rust whole blade.