Hi Fernando,
Just a possibillity........it might be a grenade.
The holes are where the explosive charge and fuse would be placed. The chain could be used to throw it or to connect it to another ball (usually if connected to another 'ball' they tended to be solid iron, fired from a cannon to 'cut' rigging and masts in Naval warfare.)
The iron ball (in your example) would be cast in two halves so that it had 'inherent' weakness....so that it would fragment better, when exploded.(assuming it is a grenade)
Regards David
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