"The cannon is English-manufactured from 1910," declared Saeed Nasser, mayor of the coastal town of Deir al-Balah, the off shores of which the seven-meter, 8.5-tonne gun was discovered. "It was discovered among the remains of a sunken warship, presumably from the First World War," Nasser said in a statement. Gaza's police chief Ayyub Abu Shaar told AFP that fishermen had come across the cannon and informed the police, who brought along a larger boat to haul it up. Islamist rulers Hamas, sworn enemies of Israel, erected the gun on a platform at the entrance to Deir al-Balah, apparently pointing in the direction of Israeli city Tel Aviv, some 70 kilometers (40 miles) north of the besieged Palestinian territory.
Update: Как подсказывает david_2, девайс похож на BL 4 inch Mk VIII. Такие как раз были установлены на эсминце Staunch класса Acorn, спущенном на воду в 1910 и потопленном около Газы немецкой подлодкой в ноябре 1917.