Various images of Chongtong and Chongtongjeon
  
      150. Sechongtong(Small Cannon) National Treasure No. 854 15 C

Length : 13.9 cm diameter : 10 mm weight : 130 g
Courtesy : Military Museum ( Donated by Park, Ho-Byung )
Bronze gunpowder armory, fires an arrow named Chasejeon, made in the age of King Sejong in Chosun Dynasty.