MOL138777 L-R: Axe-hammer, found in the Thames at Battersea in April 1915, c.2000-1500 BC (diorite); Cushion mace-head, possibly found in Thames at Kingston, c.2500-2000 BC (black silicified volcanic ash) by Prehistoric; Museum of London, UK; (add.info.: both would have been mounted on wooden shafts and were probably special objects as they are made of imported stone which has been carefully ground to the required shape;); out of copyright.