CW, WWI, or WWII?

[RustyRelics]

I have had this button for a while now, and I recently found out that someone dug one of these in a Union camp at Cold Harbor. I always thought it was WWII so what just is it?

 

[ToddsPoint]

I think it's a fashion button for a blazer jacket. Gary

 

[Tony in SC]

I also think it's a blazer button.