No, it's not a 168.029, then it would have a different, coin edge bezel.
As other said, it's a 168.019 and should have a cal.751 inside.
No need to open it up, if it's solid gold, the back should be gold as well, if it has a gold front and steel back it's a gold cap.
(Looks steel to me, but maybe just bad color calibration/white balance on the photos?)
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