Late 1800's Signal Cannon

According to my grandfather (a carpenter by profession) before he had any children, he dug it up when he discovered it while digging the foundation of the house that I am living in now. According to him, he found it when he was 27 years of age. He was born on the 25 September 1924, therefore he found it in the Year 1951 and he built a cement stand outside the house to display it. The 2 powerful hurricanes in 1990 and 1991 destroyed the cannon stand by sea flooding as we live in the costal areas.

Poor