We also have a Sinclair Oil secretarial signature ball in our family. I also did the research to see if any of these ball were ever really by Ruth. Short story is that history of these balls are wide known. No matter how good the family back story is about it being a true Ruth signature, getting a company like JSA to auth a Sinclair Ruth is not likely going happen. I've tracked the sell of them over the years and the sell for around $200-300 range. Our ball also will never leave famiy, it's still fun to own even if ghost signed.
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