At first I thought it was a pull tab!

[cudamark]

I guess it might still be one, but, it looked a bit too fancy to me after I rubbed some of the dirt off. Thin stamped metal, a ladies head in profile, and "MADE IN U.S.A." underneath. Some sort of cosmetic related item? Back side is just the mirror image of the front.

 

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[Showtime2385]

Reminds me of an assistance for threading a needle.

 

[slikriktn1]

That looks like what's left of a needle threader
http://www.amazon.com/Wire-Loop-Needle-Threader-Pkg/dp/B000YL27M4

 

[cudamark]

Could be I guess, but, the bottom has a perfect edge like the rest of the tab. I would think it would be rough if a chunk broke off. Sure is similar in appearance to the one posted though!

 

[Carolina Tom]

As soon as I saw, I though needle threader.