This is a Jaguar E-Type Independent Rear Suspension (IRS) pulled from a vehicle years ago. The gears still turn freely and everything is here. This is from a US early series 1 XKE (1961 to 1964).
I took some pictures of the tags if you can not read them they say BPL and 43/13 (3.31). The brakes are dunlops. Under the protective layer of grease is the orange pumpkin and aluminum dust cover. The diff looks to be very rebuild-able.
Or call: (425)-556-0261