A RARE WROUGHT IRON BREECH-LOADING SWIVEL GUN (SLING), of built-up construction, the barrel formed of a tube with rings welded round it at intervals, one carrying the trunnions, the breech riveted within a stirrup-shaped breeching, into which a seperate mug-shaped chamber is secured with an iron wedge, stamped 'No 27' and extended as a slender tiller with a rounded button, on U-shaped swivel: set in a wooden block, 16th/17th Century