Thanks to everyone who chimed in to help identify my crank set.Nicklin was a name I was totaly unfamiliar with so I have learnt something new.As to the date codes for Williams cranks.While there are an extra 2 figures on the crank arm,they are J5 and not two letters.I am guessing that in the very least that means that it is a Nicklin not made for Williams even though it is made in the same pattern.Thanks again, Geoff Duke Melbourne Australia