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A thousand thanks, banjopicker!
That is good news - matches the reality on the ground (and on the paper work!). The axle is stamped 6.50. That also explains why the engine block is a C1AE instead of a C2AE. The only thing that puzzles me now is that this is not a particularly heavy 600, but it has 8 lug wheels - all the other 600s I have seen this age have "big 6" wheels.
Andrew