I picked up an IWC catalogue today, and it makes for some amazing reading. The IWC perpetual calendar movement is frankly incredible as it even displays the century........ which the B29 does not.
The current century wheel in all current perpetual calendar IWC's show 20, 21 and 22, which means that it will lose it's usefulness after Dec 2299. But never fear, IWC are already supplying a date wheel with 22, 23 and 24 on it so it will last through to 2499!!
That's the kind of attention to detail that makes me love watches like this.
And some of the figures are amazing. For example the gear reduction between the seconds hand and the century indicator wheel in 6,315,840,000:1
, which means that while a point on the balance moves around 1.6m km in the course of a year, the century wheel at the end of the gear train - after no fewer than 25,228,800,000 oscillations - marks the change of the century by moving just 26 degrees! I love reading things like this. Amazing stuff! 
It's a nice catalogue too.
