I agree that's a 1977 serial number, but according to my documentation, DD1 and DD2 were model designators for the 535, not the 545. A 545 should be a DD3. The 545A was DD4 and the 545C was DD5.
The 535 was made from 1975-1978, which matches the 1977 serial number. The 545 was made from 1979-1983, so that wouldn't jive with the serial number.
The rest of the model number (DD212K) says that it's got a diesel engine, a trans driven (non-live) 540 rpm PTO , and the 6x4 manual reversing transmission.
The partial production code 7M?9B, depending on the missing number, says that it left the assembly line on either the 9th, 19th, or 29th of December, 1977.
Most of the casting numbers in your pictures start with D5NN too, which indicates that the castings were designed in 1975, so they would be for later tractors than the 4500 also.
I'm guessing that a prior owner didn't know what he had when he repainted it and stuck a 4500 decal on it, or I guess it might be possible that the loader itself was transplanted from a 4500, but it looks like the right loader for that tractor, the way the canopy mounts to the lift arm pivot point, so I'm guessing it's just the wrong decal.
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