I've asked Omega how to interpret the date code, but the answer came back that this is for "internal use only" so they don't want that information out there clearly.
The hand height reflects the length of the items that the hands attach to, so the seconds wheel, the cannon pinion, and the hour wheel. If you have a flat painted dial the posts for the hands don't have to be very tall, but if you have a dial with applied markers, the posts have to be taller so the=at the hands clear the markers. Some calibers come in 4 or 5 different heights.
As to why some are marked and some aren't, I suspect they all are, but the location may be where you can't see it on some.
Cheers, Al
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