89360 auto-winding question

I absolutely love my Yacht Club but I'm not sure that the auto-winding mechanism is working as it should. Here, in gory detail is what's happening.

I wind the watch fully and then wear it for 4 or 5 days (taking it off at night, of course). It runs very well the entire time. But at the end of that period, when I wear another watch, the Yacht Club stops after not much more than 24 hours.

My first thought was that the power reserve wasn't up to muster. That's easy to test so I did. It turns out that the reserve is just fine: more than 68 hours. My next thought is that it isn't being wound sufficiently while I wear it since the reserve after wearing it is so short. Assuming a reasonable amount of activity, shouldn't the watch maintain the reserve while being worn?

Am I crazy or does this seem like a problem? (Yes, I know that those two options are not mutually exclusive.) Thanks for any insights.

My 89365 on the Spitfire Chrono didn't indicate such a behaviour until now. I would indeed think that either you don't move enough (you say you do), or more likely, there is some issue with the movement, as it should even be 30% more efficient than the 80110 Pellaton.

Kind regards,
Paul

hi david, i have very limited knowledge regarding this but a friend who was in a similar situation liaised a lot with IWC (including sending it in) but was told that this was normal as it really depends on amount of activity when worn (my friend has a desk job). he ended up going for a watch winder overnight. regards, thang

Thanks guys. I've considered that maybe I'm not active enough but I haven't observed this with other watches and I've even worn the Yacht Club snowshoeing several times. I'll try a winder - that should give me more data about the effectiveness of the winding mechanism.

David,

Since most of my watches have power reserves I think I can tell you that your experience is not unusual. At first, the power reserve is very efficient. However, as time passes the sensitivity to movement seems to decrease. I have noticed some of my older watches do not respond to normal movement as well as when new.
My conclusion was to put them all on winders. This solved the problem.

I experimented a bit with a winder. I put the YC on a winder when it should have been almost out of power. Thus, if there was a problem with the winding mechanism, the watch should have stopped. After two days it was still running just fine. Too soon for a definite conclusion but it seems like I just need to get my lazy butt moving more often to keep the watch wound when it's on my wrist and keep it on a winder when it's not. Thanks for the input.

My fathers manual watch had several problems including smooth crown a winding wheel with a couple of missing tooth and a PR of less than 12 hours. The first two were fixed and the third was cured by a service as it was dry of all lube. The previous watch repairer had been taking money for a job he never did. Watches can sit in shop windows and display cabinets for months and be effectively baked by the lamps. I have seen watches with straps where the strap at 12 is a totally different colour to the strap at 6 and yes I am talking an IWC brown croc strap and the shop in question was in a covered shopping mall with a ceiling of glass panels 10 metres above the shop with its security glass shop windows. Any watch that is dry of lube will have issues which we the untrained may or may not see but an experienced watch repairer will see with far more clarity and certainty.