Sportster
611
This is exactly what I was looking for
Thanks all - you helped me understand. I was trying to understand if the complication eventually gets thrown out of whack completely like a moon phase eventually does.
I appreciate everyone taking the time to answer my question - and I look forward to purchasing my Sky Dweller 
Sky Dweller Annual calendar question
Hi all, just a quick question around the annual calendar complication in the sky dweller. How long does the annual calendar remain accurate? Specifically, does the watch eventually become obsolete because the annual calendar no longer keeps accurate track...
You need to
correct the date once a year, only at the end of Feb. Rest of the year it keeps track of month and date correctly,
You have to set it once in a year.
This is after February. It will keep track in all other months having 30 or 31 days. BTW, it is the same with all other ACs I know. Best, Volker
You’re confusing ACs and PCs with the moonphase complication.
Since the exact same thing happens every 12 months, the mechanics are set for that, and that’s it, with user intervention at the end of February only – seeing as it’s the only month with a variation every 4 years.
The inaccuracy does not add up in an annual calendar
I gather this is inquiry about? An annual calendar switches date like any other watch per day. The difference is that the annual calendar has got a programed wheel for the lenght of each month and hence how "long" the date change should be.
Sportster, it sounds like you are asking if the watch needs to be thrown away at a certain point?
"Obsolete" may not be the right word. Watches are simply set again if their moonphase is off. They are not obsolete. Same with annual calendars (at the end of February, as people have said). You are perhaps thinking of perpetual calendars with the year wi...
Happily, if you have purchased an IWC perpetual, with year indication,
you have a spare piece in your box that will take your watch from 2199 to 2499 Cazalea ...
This is exactly what I was looking for
Thanks all - you helped me understand. I was trying to understand if the complication eventually gets thrown out of whack completely like a moon phase eventually does. I appreciate everyone taking the time to answer my question - and I look forward to pur...