(YAHOO!NEWS) — In 2008, Tony Marohn visited a local estate sale where he paid a “nominal amount” for an antique oil stock certificate. And now, Marohn’s family is suing soda giant Coca-Cola, saying the certificate entitles them to 1.8 million shares of the company’s stock, worth an estimated $130 million.

Marohn passed away in 2010, but not before tracing the history of the stock certificate from Palmer Union Oil Co. to Coca-Cola. Reuters reports that Marohn made the connection through a series of now-defunct companies, including Petrocarbon Chemicals Inc. and Taylor Wine Co.

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