It depends on many things - such as the condition, if it has any inscriptions, if it has a certificate of authenticity. A Mantle signed ball goes for around $600 in good condition with no inscriptions UDA certified. It can be upwards of $1,200 depending of inscriptions. A Robinson ball recently sold for $1,250 in ok condition JSA certified. Both of these companies are highly trusted therefore making them valuable. I have never seen these two on the same ball but I would need more info to properly price it. No matter what I'm very jealous and you're very lucky.
I'm new to this site so message me or something and i could help you out more.
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