That’s the Sultan Mosque in the background.  We have unused cards of Brunei; cards of Brunei mailed from somewhere else; and cards from somewhere else but mailed from Brunei.  It has proven harder to get a card OF Brunei mailed FROM Brunei, with stamp and postmark, but here is one.  It has a small return address rubber-stamped on the reverse, and slight water staining.  1970s?  Grade: 2