Other than cool points, which is as good a reason as any, I have found one other reason why the 321 is better than the 861/1861 in the Moonwatch. It is debatable whether it is a good reason, but if you want your chrono hand to hit the 4 sub-second marks on the std Moonwatch dial, you need a movement that runs at 5 or 10Hz, the 861/1861 runs at 6Hz so only ever hits the full second mark, it misses the rest by design. They fix this on other Omega models by utilising either 2 intermediate marks for the 1861 and 3 marks for the 3313 and 930X/990X movements which run at 8Hz (as used in the Speedmaster '57/Racing) but the 1861 Moonwatch still uses an incorrect 4 mark pattern. See below for a comparison:
Current 1861 Moonwatch, wrong number of marks for 6Hz movement frequency:
View attachment 903969
Silver Snoopy using correct 2 intermediate marks for the 1861
View attachment 903970
Speedmaster '57 using 9300 8Hz movement with correct 3 intermediate marks.
View attachment 903968
So much for the Speedmaster Moonwatch being a precision timing instrument, it hasn't been able to accurately time to a finer increment than 1 second since the 1969 movement change
There you have it. If you want a watch with the std Moonswatch dial which can accurately measure elapsed time to within a quarter of a second, you need the 321, the 861/1861 are only giving an approximation. QED.
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