ABERDEEN HARBOUR BOARD.

Rosanoski regards A459 as more likely than A204. Mitchell shows the A459 funnel with the letters “AHL”, which Rosanoski considers illogical.

In 1974 the funnel changed from A459 or A204 to A460, with a wave motif. The account says that no flag was used, although the Board held an Admiralty warrant to fly the Blue Ensign defaced with its motif.