An internet search shows that someone by that name was born April 10, 1781 in South Africa. He died on Oct 24, 1850 in South Africa. He was a farmer.
There are no entries at genforum.genealogy.com or at familysearch.org for that surname, Pogtieter.
There are some with a variation of that spelling, Potgieter in South Africa. There are several Jacob Pottgiesser's in South Africa.
The date that you show on your post, 1833/4, what is that for, a birth date, immigration date, death date or other?