I have the Rose Gold version of this watch and love it.
It was created as non-limited edition anniversary watch for the year 2000, which was also VC's 245th birthday (hence the "245" in the Ref. number, 47245.
Vince Kaufmann, Head of VC's Design Team, told me that this was his first design creation at VC.
1. & 2. VC, as a policy, will not provide this information. But I'm sure it is not very high, even though it is not a limited-production piece. The watch was made primarily in Rose Gold and White Gold. There is also a Platinum version, and I've been told there is even a rarr yellow gold pieces that I have seen before. The black dial version only came it a whtie metal. (I believe the black dial piece was platinum? Or was it WG?)
3. The rated power reserve of Cal, 1126/R31 is 40 hours.
4. The gears and mechanism for the retrograde date do not like to turn backwards after they have been engaged/initiated. This is why VC says to not set the calendar during the hours of 10pm to 1am. The mechanism is engaged during that time and is not released until afte 1am.