A New Jersey resident found nearly a dozen suspected Prohibition-era glass whiskey bottles washed up on a New Jersey beach.

Nearly a dozen perfectly sealed whiskey bottles dating back to Prohibition times were found by Austin Contegiacomo while walking his dog along the beach in New Jersey.

Lincoln Inn whiskey was distilled in Canada and may have been one of the companies that later became Seagrams, although it’s not entirely clear. But how the whisky bottles ended up in the sand is a mystery. Contegiacomo suggested they may have been sucked up by dredging machines off the coast and deposited on the beach.

The Canadian-branded booze was discovered in February, prompting speculation about how it wound up at the Jersey Shore.

A U.S. Coast Guard rescue swimmer and his dog stumbled across something unexpected on a New Jersey beach last month: nearly a dozen rare and mysterious bottles of whiskey.