The time is also the A standard for the World Juniors and European Championships & close to A Olympic Standard.
It also moves him to 5th in the all time list.
“I cannot emphasise enough how remarkable that run was,” said Olympic team manager Patsy McGonagle.
A year ago Mark set a new junior record for the 800m event – 1.47.09.
Today’s run knocked more than second off that.
Sarah Collins set a new junior national record 16.41.49 in Koblenz.