Interesting. The original had 4 marks... the new ones have 2... I read:
The sub-second divisions for the central seconds are now correctly graduated for the movement. In the outgoing model, the seconds track has five divisions per second, which does not match the 3 Hz (21,600 beats per hour) of the cal. 1861/1863. The dial on the new Speedmaster has a track graduated with three divisions per second, which tallies with the 3 Hz of the cal. 3861.
As an aside, the reason for the mismatched scale on the previous-generation Moonwatch is historical. The earliest Speedmasters was equipped with the cal. 321, which ran at 2.5 Hz, making five divisions per second correct.
As we outlined above, the cal. 321 was later replaced by the cal. 861 and its variants. Although the movement was replaced, the dial remained largely unchanged, perhaps in an effort to retain the lunar halo of the original. With the new Moonwatch conceived as an evolution of the original, as opposed to a remake, its designers clearly had the liberty to afford these subtle modifications.
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So it is slightly different than prior models, but seems to have been made with some logical reasoning. I don't think I would let that bother me much. You can't replace it with the white dial, as you would have the same problem. If you got the older dial, the minute hand would not line up as readily.
I think you have the perfect watch. Enjoy it.
