A few yrs ago I changed the rear cassette to 11-34 so also had to change this out to a GS/long cage derailleur-- so this derailleur has been sitting in a drawer for a few years.
Vintage Shimano Deore XT RD-M750 Rear Derailleur 9 Speed Long Cage Japan MTB Have some used signs and scratches See the pictures for more condition details thank you
Pulleys are dirty with noticeable tooth wear but remain intact and spinning. Hardware and springs show light surface corrosion. Cage pivots and spring tension feel normal by hand; shifting not tested on a bike.