Shell casing, 40 mm, anti-aircraft, brass, 1943, World War II. Found in the yard of Christine Loizeaux on Keel Way, SWH. Now 2 inches high, cut down from about a foot long. Souvenir probably used as an ashtray.
“Shell casing,” Southwest Harbor Historical Society, accessed February 24, 2021, https://swhhs.net/digitalarchive/items/show/633.Item 1627