[CR]Campy pedal question

I asked this question yesterday about the early 60's Campy pedals. I've posted two photos, one of which is a pair I have and the other is a pair from ebay. If you look at the two photos, compare the quills. You'll notice that the pair on the left have a definate asymetrical appearance, while the pair on the right are more symetrical. My question then is, when did Campagnolo produce the pair on the left and when did the change to the more symetrical design? View the photos here: http://www.iag.net/~davidg/CampyPedals.htm

Thanks

David Goerndt