Hi Dave,

please have a look at the link below. But you should remember, that the named 42 h power-reserve is valid only for watch equiped with a quite new and really fully-wound mainspring. On your wrist or on a usual watchwinder, which stops from time to time, you will usually never get the mainspring fully wound (unless you wear the watch while doing sports). Sure, you can wind it by hand until it should be fully wound, but, do you have the ability to recognize the moment, the fully wound mainspring of an Cal. 11 Automatic is break-protected by its safety device? Not me!

So the question should be: Does your watch stop during normal wear? In this case, you should ask your watchmaker. In the other case- enjoy it.