Hi that is a very early 454 with a D-179 with a CAV injection pump instead of the later Bosch VA pump. My Dad bought one in 1972 and my brother has it now and it is still running well with a few minor
hydraulic leaks and has well over 20,000 Hrs on it.
My brother also has the newer CIH 495, same tractor with D-179 Diesel but it has the newer Bosch VE pump. Both very good tractors.
Very unusable for the engine to seize, most common problem was coolant in the oil caused by leaking sleeve O-rings, also could have left it out without muffler covered and cylinder is full of water.
The other place to check is open the inspection plate under the clutch housing to see if the pressure plate fingers are all there.
Usually the parking brake doesn't work as an Operator drove it with the brake on.
As someone else said 454,464,484,485,495,3220 all same basic tractor with refinements over the years, last year of production was 1997. Engine made in Neuss Germany, rest of tractor made in Doncaster, UK,
some may have been crated and shipped the Louisville, KY, USA and final assembly there using parts common with the IH USA tractors like the 404 and 504.
See links for manuals and a person that rebuilt a D-179 this past winter.
https://www.redpowermagazine.com/forums/topic/134509-d179-engine-rebuild-with-oversize-pistons/
Good luck
JimB
Manual 454