1951 $2 green and scarlet, perf 17½ x 18, showing error St Edward's Crown in watermark; superb Mint NH, one of the rarest watermark varieties of the British Empire; cert KGVI Expertising (2006). (Image)

1955-59 30c Oil Tanker violet & brown-purple mint n.h. block of 10 with stamps 3-5 showing partial omission of the Queen's head, very fine and very scarce, only one sheet existed with 30 stamps showing this error, a spectacular rarity of Singapore; cert. BPA (2016). Note: Enclosed is a picture of the original sheet and correspondence of the stamp dealer describing how it was discovered. (Image)

1973, Definitives flowers & fruits, complete IMPERFORATE set, unused as sold, scarce (Image)