Maybe it's the relatively gentle motion of the autowinder. Maybe on the wrist with more bold movement it would fair much better?
I've a Cal. 12 Monza, and it was the same, I lent it to James, he wore it for a while and didn't report any problems - maybe he's just more active than me!!

Cheers
Stewart

: So, I have my 1163 on my winder and I don't know why it can't seem
: to hold it's power reserve like my other Autavias... this model
: uses the Calibre 11-i... Can anyone shed some thoughts about
: this? I've been told these weren't the greatest back in the days
: and I'm thinking the watches of the time didn't take into
: account autowinders...

: ~George