Bingo, thats the fellow. I've just got to find a new bearing to fit it and I will never have to buy another jockey wheel again! I cant begin to imagine how much a set must have cost back in the day.
Not all that much, actually. Some have been less than happy with them (the float of Shimano pulley turns out is a good thing). But I have had a set since 91 that are still going strong.