[2] Allan Frederick Jacobsen became the 29th Scot to reach the milestone of 50 caps when he played in Scotland's 19–16 triumph against Samoa at Pittodrie Stadium, Aberdeen in November 2010.

It rounded off a year when Jacobsen was lauded by Scotland's scrummaging coach Massimo Cuttitta for the part he played in the 2010 summer tour victory in Argentina.

On the 2004 summer tour to Australia, injury curtailed him to only two outings (against Queensland Reds and New South Wales Country), but he regained his starting place for that year's Autumn Tests series.

He was chosen at tight-head prop for that tour's warm-up match against the Barbarians but had reverted to his customary position on the left of the scrum when he won his first cap.

Misfortune struck when he damaged a leg on his World Cup debut during Scotland's opening match against Portugal in St Etienne, and because of the injury he had to drop out of the squad.

But he was back as loose head for all of Scotland's matches in the 2008 RBS Six nations Championship, including the Calcutta Cup victory against England at Murrayfield, and later that year he continued in that role for the two Tests in Argentina.