I'm on iPhone so I will make it short. You are very well informed Bones and you are a100% correct. Yes, the escapement is well designed and it does reduce friction BUT.... All the co axials I have seen (you can also google it) have the train gear jewels oiled + all your regular wear spots like the keyless. Fact is that no oil or grease lasts 10 years......
How often have you disassembled a co-axial?.....Me 6 so far and when I say it is marketing bullsh!t I CAN say that. Why? Besides the fact I am a watchmaker in the evening for this board and 2 local jewellers I have a daytime job as marketing manager for a huge multinational. So in this case I know all the insides of the movement, the design, it's flaws and the marketing gimmick that is behind it.
Sending a watch back to China is always your last resort. You are dealing with an unreliable postal system and dealers that are Chinese natives with American names who get hundreds of emails a day. That is just asking for trouble. Especially when it is a silly little thing as a rotor decoration. Just my 0.002.
Don't you f#cking apologize Tony! All of you have every reason to be angry. Emotions make you do some crazy things sometimes. This is a ridiculous situation.
Only 3 possible things.
1. Bad/ dirty teeth on the chronograph second wheel
2. Bad / dirty teeth on the tilting pinion
3. Chronograph second wheel spring has too little upward tension.
PS: very common problem and causes no harm what so ever. Just aesthetically not very appealing. It does not affect time keeping.
There is no way of knowing for sure without tearing it apart. But from my experience the AP OS with sec @12 are the worst to use daily. Besides the usual bad oiling and dirt of the A7750 they have design issues due to the seconds transfer from 9 to 12. Extra wear could lead to an early dead without propped care. So it all depend on how much money you want to invest and if you really care if it breaks down.
Read this: http://www.rwgforum.net/topic/134432-qa-why-do-our-a7750s-need-a-service/?hl=+need%20+service
And this http://www.rwgforum.net/topic/143915-faq-to-service-or-not-to-service-my-thoughts/?hl=%2Bservice#entry1158012
For a daily beater my advice would also be the Diver.
Did not know it was purely rep based. Thought it was a gen database of some kind to find your favourite pam model.. E.g. Gold, second at 9, etc. Keep it mainstream and you can commercialise it later on if you want. That would be my advice to you. The rep community (although I love it) is just too small.