Bryan/Martin
Thank you for the information, I will try your recommendations and report the findings.

Regards

Martins comments are about right, but i would
: add this.......if the watch isn't worn a
: great deal and doesn't get fully wound and
: unwound regularly then the watch oil may get
: alittle sticky and the main spring isn't
: being used like it was designed to be and
: may get a memory effect. Also has the watch
: been subjected to any extremely cold temps
: since it was service.....old springs don't
: like extreme cold or heat?.

: Also try laying the watch in differring
: positions at night on your bedside table and
: observe if the problem chances. My Cal 11
: siffert runs for about 38hrs before the time
: keeping slips, but the Caliber 11 is quite
: fragile and a common fault with these is a
: date change problem associated with the
: watch stopping........does it stop shortly
: after a date change ? or there abouts. If it
: does, then chances are either the date wheel
: or hour wheel{parts 2558 and 2556} have a
: bent or broken tooth. Commonly this is due
: to the click over of the date at 12,so... to
: check this, if your watch stops, advance the
: time by an hour or two then shake the watch
: to start the movement without hand winding
: it, and see how long it goes runs for. If it
: stops again before the date change is due
: then its probobly the hour wheel,or a weak
: main spring, if it doesn't stop till the
: date change then it could be the date
: wheel{more common}.
: Hanz is unlikely to have got something wrong in
: his service, but if it was 18mths ago then
: there has been alot of ticking going on
: inside the watch during that time, if you
: see what i mean.
: Its probobly wise to get its serviced again.

: Hope this is of help.
: Bryan

: What should be the power reserve time for the