Gerrard-Perregaux history - Great-grandfathers watch part 2!

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https://omegaforums.net/threads/gre...ch-wanting-to-learn-more.168637/#post-2296294

As a new thread building off my other post at the link above, I recently inherited a vintage omega and Gerard-Perregaux. This is the info I have on the GP as you can see from the photos. This one is even more of a mystery but came via my late grandfather who grew up in Holland, just outside 's-Hertogenbosch and post WWII moved to Australia where he spent the rest of his life.

Looking to learn more about this heirloom piece! Again - keeps time well, fully working and the lume on the hands still glows nice and bright.
Edited:
 
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IIRC, the first two digits in the movement are the caliber number, so this would be a GP cal 30 movement.
 
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Hi,
The ébauche is from A. Schild, the caliber should be something of the AS 1203 or 1311 family, the exact reference number should be visible under the balance wheel.