Looking for a source for info on GP movements?

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I recently acquired a very attractive Girard Perregaux Traveller, Ref: 49400.0.11.817
I would like to know what the movement inside this watch is and so far my research has come up empty
If anybody can point me towards a source for this sort of information specific to GP watches, it would be vey much appreciated.
Thanks
Edited:
 
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If it is useful, the complete Ref # is: 49400.0.11.817