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@ghostface
Hi Ron, it is the short cage version. I have always run short cage derailleurs with 39/53 up front and then 11-25 or 12-26 at the back... according to the below post it is possible to run with a bigger cassette - if you allow for extra chain length...
http://forums.roadbikereview.com/campagnolo/13-29-short-cage-derailleur-131507.html
I'm sure there are people here who have experience of such things, what cassette would you be using it on?