My parents recently discovered an M.S. Dunera lapel badge amongst their collection. The badge has the ship’s name in gold on a dark blue ring on the outer of the badge.
In the centre of the badge on a gold background is a red and white crossed ensign (an X shaped cross as opposed to a + shaped cross). The badge was made by Fattorini and Sons of Birmingham and am pleased to say they are still going strong (see http://www.fattorini.co.uk/ and http://en.wikipedia.org/wiki/Messers_Fattorini_and_Sons)
I will take a picture of the badge and post that in the next day or two in case others have similar memorabilia or know more about the origins of the badge.