So a guy in Massachusetts got to looking at his grandpa’s old military souvenir, which everyone just took to be a keepsake.
Then he noted the bomblet had a charge inside.
From the video, the device looks to be a WWII-era AN-MK23 Mod 1 Practice Bomblet of the type used by the Army Air Force and the Navy and are made to hold replaceable spotting charges, a special 10-gauge shell with about the explosive power of a blasting cap. The light blue color, officially “Deep Saxe Blue” denotes practice use and not totally inert devices.
While inert models surface for sale here and there, live examples are recovered in the wild from time to time.