Can you spin it round and take a pic from the back for me?
I was looking at the guide here: http://www.retrobike.co.uk/forum/viewtopic.php?p=1464767
and the top pull one has a big extended piece at the bottom that I should be able to see in the pic and I can't, the bottom pull would be hidden with the clamp bolt next to the cage, seems to be a hard job tracking down one like this so worth double checking.