I suspect this is a revenue cancel on a Rhodesia Scott #74, but I really would like to here somebody tell me it is before I send it back.  ANSWER:  it was a revenue cancel.  Thanks for those who answered ages ago.

rhod74.jpg (39468 bytes) "Normal"

rhodlite.jpg (38773 bytes) I've lightened the stamp so the cancel comes out a bit more

rhodgrn.jpg (26696 bytes) and rotated.  Note the BSA/C perfin ( British South Africa Company ).