Is the Dura Ace CS 7900 or the Ultegra...
Is the Dura Ace CS 7900 or the Ultegra 6700 compatible with an 4 year old durace derrailer? No identifying marks on current derrailer, except the Dura Ace stamp.
You should be fine there, as long as it is 10 speed.
It is compatible if the derailleur is from before 2004 because before then Shimano was only making 9 speed.