A complete and correct set counts as a Dinkie 548 pen, a Duropoint 2 pencil (actual style of the pencil will vary according to exact date) and a penknife (marked on one blade 'Conway Stewart' and on the other 'Made in Sheffield'), alll in the same material and enclosed in a matching leather pochette (which should be marked 'Dinkie, Conway Stewart, London' on the inside of the flap and should have a mirror on the back of the flap holding the pen).
One of my sets is pictured below. I know of at least one other set in this harlequin colour and I also have examples in lapis blue and blue marble.

So if you have one - or know anybody who does - please let me know the colour and other details (with a picture if possible) and let's see how many of these little gems still exist!
In passing, if anybody has a 'jade green' (i.e. green measles) CS penknife in good condition that they would like to sell me, I could be their friend for life!!
Andy