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.

Austin Contegiacomo was playing catch with his Sheepadoodle on the cold beach near Margate last month when his dog abandoned the game and began sniffing around. There, lodged in the sand at the high tide line, were nearly a dozen sealed bottles of whiskey, embossed with “Lincoln Inn” and a detailed depiction of a man riding a horse.

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