Damaged was a heavy metal band from Ballarat in Victoria, Australia that was formed in 1989 by drummer Matt "Skitz" Sanders. The line-up was completed by bass player Jason Parker (aka "Mohawk") and vocalist James Ludbrook. Guitarists Jarrod Bongiorno and Paul Meddick were also members briefly before Chris Hill (aka "Hilly") and Mat Silcock joined the group.
A damaged coin would be one that has had something happen to it to cause a defect. Examples would be: holes, bent, major nicks, corrosion, scratches, mutilation. Usually makes the coin worth much les than one without any defects.