Weird Find in the Ocean of Turks and Caicos. Any Comments?

[roberto_baggio7]

Hey guys, I joined this forum because I found something weird in the ocean while on vacation. See pictures below. It looks like a rock that has some sort of coin in the middle. On top on the coin there was a plastic cover with the Letter "A" and number "18" to what I could see.when I lifted the plastic and cleaned up the black gunk, a small piece pealed off and revealed the graphic you see in the picture. Does anyone know if this is anything special? Looking forward to your thoughts!

 

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[DCMatt]

Interesting but not enought detail to identify it...

DCMatt

 

[diggummup]

Looks like an encrusted cap or lid to me, hence the plastic sealer ring. Doesn't take long for a piece of cheap metal to look like a rock in saltwater.