"The problem is that some supply houses have old stock which are sealed in these silver bags and there is no indication as to the jewel count of the movement unless one opens the packet to be sure!"
I suspect that some supply houses may buy nos unsealed movements when they are offered at a discount and sell them with the disclaimer 'new, not in original packaging' or 'may need to be serviced' etc. 'Silver bag' movemnts are another story and they are sealed in the bag to keep them clean and slow down ageing of the oil. I have never seen a chart or anything to make sense out of the codes on the packages.
"The other problem is that swatch/ eta group who sell these movements are notoriously unhelpful in directing you to even getting close to an answer or having the courtesy in answering what to the catalogue number on the packet suggests!"
From what I have gathered in 40+ years fooling with this stuff, most of today's swiss watch companies seem to (all imho):
1...Look down on their customers as suckers who will pay 5X or 10X what a watch is worth if the right formula is used to entice them.
2...Slick adventure/macho ads featuring actor/sports hero 'Ambassadors' rev the suckers up and make them hot to buy the latest Tough Guy Watch at highly inflated prices. Making them hard to get also helps.
3...Cut parts off and they will have a codlock on parts and service at astronomical prices...shoddy service becoming the rule in many cases.
4...The same riff raff that makes watch companies rich should never be allowed to come in direct contact with anyone in authority at any Hallowed Swiss Watch Company. All 'secrets' must remain secret.
I for one will be grinning like a possum when the next 'quartz crisis' brings them to their knees.