Here are my 2c
Pouring Gold values.
The 2 on top have no watermark which would make them Scott 376
The other 4 below all appear to have a watermark but only on one
I am certain that it's
Wmk. 359 the
RSA Tete-Bechewhich would make it Scott 329.

After I scanned that I noticed that there is something with the postmarks
on these stamps that I hadn't noticed before.
And lo and behold it appears that these 4 singles used to be part of a block
when I fit the jigsaw together.
PRETORIA
19 XII 72-15:30
Everything looks fine except the second partial postmark does not continue
into the white border or touch the stamp on the upper left.