MacGregor type OA/8B Hickory Niblick Here is the niblick from the OA set. I reproduced from an original club this niblick for those wanting to add the niblick to their set of Star OA irons. The OA set had 5 original heads in it's make up, but in the late 20's they produced a full set of popular irons with the markings of "B" and number. Loft 56, length 36 and hand wrapped grip.