I just thought I'd run a quick poll for owners of the 7 Day movement. So thats BP's, BI's, 7 Day Portuguese, etc.
While I love the fact that its an in-house movement, and it undoubtedly has one of the most efficient winding mechanisms EVER, I also think that the 7 day movement has one of the worst time-keeping reputations I've ever come across. Most people who own them seem to be a little "backward in coming forward" when it comes to being open and upfront about the timekeeping, so this is your chance!
I've owned my 5004 BP for almost 2 years now, and in that time it's been back to IWC UK three times and to IWC Switzerland once, all for its timekeeping. At worst it was gaining over 25 secs a day : at best (i.e. now) 10 secs a day, which is still outside of the 0/+7 seconds that IWC claim all their watches are regulated to. Now I'm not one to bash the brand as I love IWC watches : I've owned a few over the years and all their ETA based movements have been nothing short of superb. This BP is my first in-house IWC.
For a while I assumed mine was just a bit of a "lemon", but then a mate of mine bought a Big Inge, and lo and behold, it gained time like you wouldn't believe. (In fact he was joking that if he took the crystal out he could use it as a fan! ). This got me wondering, and through various AD events I've come across three other 7 Day movement owners (another BP and two 7 Day Portuguese owners) and all of them to a man told me that their watches gained an unacceptable amount of time.
This is in contrast to the general response on forums where people always seem to claim that their watches are spot-on accurate. But the cynic in me thinks there may be an element of embarassment coming into play where people dont want to admit that their £8000 watch is anything less than perfect.
So here is a poll where people can answer anonymously if they wish. If people are honest it could well be interesting........ Or it may show that by pure random chance,I just happened to meet 4 other people with the same issue as me!