Maybe from the 1715 wrecks?

[Hangingfor8]

I found this on a known wreck area of the 1715 fleet on the treasure coast of Florida after the hurricane. It was encrusted when I recovered it and I cleaned it to this state. When I could see file marks I stopped. It's brass and about 3 inches long. Any ideas?

 

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[GaRebel1861]

Side plate off a musket?

 

[Trez]

That's also what I'm leaning towards...
But you never know...someone in here has one just like it, you will get your answer soon.
Trez

 

[coinman123]

You can see your part on the bottom right of the photo.