Ancient piece of bronze!

[vince76]

Hi guys
I found this piece of bronze in a site where i have found only coins from 300-400 BC. I have found there also some sling bullets but not coins from other periods.
It looks to me like a stamp but maybe anyone has a better idea.
Thank you

 

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[Sentrom]

I wonder if it could be a weight for a scale? Size and weight might help.

 

[vince76]

It weights 58 grams. The square part is 1.5 cm & 3 cm.

 

[Tony in SC]

Resembles a fly weight for a governor.