Thomas,
As an AP fan myself, with a dedicated chronograph movement in one of my AP watches, I was careful to specify 'dedicated' chronograph movement.
Otherwise, it's like me (physician) saying: "Well, I started off planning to do a liver transplant but whilst we were all looking at the MRI scans, we decided that maybe we could append a piece of kidney or adrenal gland, here and there, and make it do something else instead. It will work just as well and actually even better than most people's original organs because our hospital is in the top-3 world ranking" and we have very good skills.
I also corrected my typographic error: 'tried and tested' and NOT 'tired and tested' JLC base.
Regards,
MTF