Shiver Me Timbers wrote:
Probably that Rudolf Harbig 800 record that lasted about 25 years
Harbig's 1:46.6 lasted from 1939 to 1955. The single greatest performance was probably Walter George's 4:12-3/4 mile of 1886; it wasn't beaten until 1915-and then only by a fraction, 4:12.6. It took Nurmi in 1923 to really improve significantly on it with 4:10.4.