What is this?

[Paeonian]

It looks to be made out of bronze and I presume it is a decorative piece of armor but I might be wrong.
Can anyone tell me what this is exactly and approximately how old it is?


From the top

From the side


From the bottom

 

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[sprailroad]

Perhaps a lid to something?

 

[Paeonian]

Perhaps it is.If only I knew from what time it is or where it's from.