Spanish Signal Cannon, ca. late 16th to mid 17th Century A.D. A rare Spanish signal cannon, ca. late 16th to mid 17th Century AD. It is 3-1/2 high, 3-3/4 in diameter and is heavily encrusted. These were used to signal ship-to-ship or ship-to-shore. Rare find! Ex Routh collection. Value range: $400 - $500.