18th C. industrial design 30 minute sandglass is made of bronze and wood and filled with fine white sand. Collectable because of their combined historical and practical value. Navigators tried to keep count of the hours: the galleons wrecked on the Western Australian reefs remind us of the perils of incorrectly kept time. If we do not have this item in stock we will order it for you from our supplier. Delivery generally takes 3 weeks within the UK. For overseas delivery queries please email sales@stanfords.co.uk