Antique Fireable Brass Desk Cannon on Wood Base

This antique brass barrelled cannon measures 9 inches long, the barrel which is hollow with a taper hole on the top looks like it is firable and based on the colour inside has I think been fired in the past, it is mounted on a stepped wooden carriage and attached by a tight string. Ideal for a desk ornament it is heavy and comes in good condition with signs of age and use.