ROSLYN, N.Y. - Workers restoring the historic Roslyn Grist Mill made this discovery of a lifetime buried away in the structure's concrete floor by two men 103 years ago: Intact and unscathed letters and four vintage coins, including an 1863 Civil War Army and Navy token, tightly tucked in a weathered glass milk bottle."One was a carpenter who had a building across the street and the other was a mason, Romolo Caparrelli," said Howard Kroplick, president of the Roslyn Landmark Society.The two were part of a team tasked by poet William Cullen Bryant's grandson to preserve the building originally built in 1715."For 150 years, it was a successful gristmill and then in the late 1890s it was abandoned as new technology came in," Kroplick said.Part.