I'm positive it's just a modern external star lock washer, of which there are many variations.
https://www.bing.com/images/search?...-25&sk=&cvid=A8930E6FA19F483CB539937A3D97C8D1
Depends on the application and if you need it to be rust resistant.
I will get a better picture uploaded....I guess what is odd on this one is that the outside pattern is not the same, there is a small hole tapped through and it was found in an area with no pipes (or electricity). Thanks all for your help.I looked it up and yes you are right there are brass lock washers just as there are brass springs. I imagine a different alloy is used. There is also a type where a tab is bent up to lock the nut in place.
But i dont think this is a modern lock washer, unless you can find an exact match. I would be more inclined to think its one of those parasol center pieces or maybe from a motor armature.
I will get a better picture uploaded....I guess what is odd on this one is that the outside pattern is not the same, there is a small hole tapped through and it was found in an area with no pipes (or electricity). Thanks all for your help.