It began from the birth of Robert Stevenson in 1772 to the death of D Alan Stevenson in 1971, and included personal artefacts belonging to Treasure Island author Robert Louis Stevenson. The author’s grandfather, Robert Stevenson, invented intermittent flashing lights, and his descendants designed most of Scotland’s lighthouses. https://www.expressandstar.com/news/uk-news/2024/02/09/stevenson-engineering-archive-fetches-115000-at-auction/