[Grndhog89]

Not quite.

The H-10 (ETA C07.611) has a standard jeweled escapement and a standard metal mainspring.

Nobody uses silicon for the mainspring. There are some movements with silicon balance springs, including a version of the Powermatic 80, but the H-10 doesn't have one. Current versions use Nivachron for the balance spring which is antimagnetic, but still a metal alloy.

And none of them are disposable. They are all fully serviceable, including the "plastic escapement" version.

Actually this has a Nivachron balance spring.

 

[Grndhog89]

@OP - what is the brown leather strap you got? Link?

I think this would look great on a brown leather nato.