HELP! Is this a Spanish Cobb?

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Hey guys! So, I found this at a beach with very powdery sand. It was pretty deep, and I can kind of see a cross on the front, but the back is wiped. It was black when it came out of the ground, but it cleaned up well with some silver cleaner. It is slightly smaller that a dime.

 

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Melted aluminum would be my guess

 

[bradyboy]

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