Germany's Warburg offers to repay money in sham trading trial

FRANKFURT (Reuters) - MM Warburg, part-owned by one of Germany's oldest banking dynasties, offered on Wednesday to repay some gains from a share trading scheme at the centre of the country's biggest post-war fraud case, a letter seen by Reuters showed.The trial in Bonn is focused primarily on two investment bankers and is the first in a wider investigation aimed at recovering billions from banks which prosecutors say profited from so-called cum ex trades.A court spokesman told Reuters by..