Button ID help....Texas cabin site

[Baggins]

Found these two buttons this past weekend at the cabin site I have been hunting...The white one feels as if it is glass and is very small...the other appears to be copper, or brass and I can't make out the back yet...it is soaking in olive oil....any idea on age? As always, thanks for stopping by and looking.

 

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[geckokid]

Looks very old, but don't know?

 

[CRUSADER]

Shirt button probably 40 years old but they didn't change much so hard to tell.