Harmonica Reed plate, brass?

[Tipton]

I'm trying to figure out what the reed plate is made from. I found it not far from a parasol part.

 

[TNGUNS]

Think they are usually brass. Would be a safe bet to say the metal content would vary. I have dug them that look like pure copper as well. Doubt you will narrow it down past that but you may get some better feedback from some of the relic gurus on here.