This is a 19th century or older example of a trade unit known as a Manilla. 

Large, heavy examples of manillas such as this example sometimes were referred to as ‘king’ or ‘queen’ manillas and were believed to have been used by the nobility as a store of wealth and to settle transactions for significant purchases such as land, slaves and brides. 

This type was forged in Africa. 

The bronze measures 8 inches across and measures 8 inches tall on a custom display stand.

 Provenance: A private American collection.