Chas, could you enlighten us as to why there are 'cheaper' Chinese tourbillons available to us now but the other interesting complications such as repeater remain on the high-end? Is there a chance we'll be seeing affordable movements with such complications in the near future, or is there just not enough market for them the way there was for tourbillon movements?
Repeaters don't have a cool whirly thing on the dial like a tourbillon, hence less market. Probably the same reason why there are dozens of open-heart movements but only one alarm (ST28), and Sea-Gull have not shown much interest in promoting that one either.
Open heart movements are particularly interesting as there is no equivalent made anywhere else in the world. For the Swiss, Russians and Japanese, 'open-heart' just means a port-hole on the dial, rather than a complete re-engineering of the movement the way the Chinese do it.
The whole thing about copying foreign designs is a distraction. The best Chinese watchmaking is in-house designs.
Getting back to flawless51's original (amended) question; the closest you'll get to a high-grade 'simple' watch from China are vintage pieces like the extremely rare ZuanShi SM2H and Sea-Gull ST7. The Chinese have never really gone for wrist chronometers of the award-winning kind. Even the marvelous ZuanShi SM1 has only a basic regulator; and this on a 13''' movement with 12mm balance and a 55 hour power-reserve. It's chronometer capable, but at the time there was no interest in chronometers in China, but much interest in very good 'ordinary' watches.
Getting more specific
Are there any Chinese movements that are based off higher caliber movements (GP, JLC, etc)?
Well no there isn't, because such movements are generally:
- unnecessarily complicated for what they do
- 'better' than they need to be to achieve what most customers want
- an odd mix of modern and archaic technologies
- complicated, inefficient and expensive to manufacture
- only attractive to the hard-core enthusiast who would never buy an imitation
And any watchmaker with the skill to replicate such movements to a standard worth bothering with has surely got better things to do with his time, such as designing an effective dual-axis tourbillon to sell for less than $100,000.