Help with a coin ID!?!

[dicejr]

I found this coin at a local construction site. It has the bust of a woman on the front and the date is visible - 1897, but no other writing is visible. On the reverse is a wreath with the number 20 in it. It is the same size as a nickel and it can be picked up by a magnet. Any Idea

 

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[dicejr]

Thanks for the ID Buckram, this one had me stumped.