metal button - age?

[Stegner]

Button is dime sized - possibly copper with hints of silver gild. No markings on front - markings you see on front just look to be deformations of the surface. Back is rusted ?tin?...shank is hard to see. Found this on someone's property - I'd like to be able to give them some historical info on this - any age range based on the pic/description?

 

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[fyrffytr1]

From what i can tell it is a modern civilian button. It is probably less than 70 years old.