Just wanted to add some additional info/photos: I had the rotor bearing replaced because it was a little wobbly (even more so than a normal Valjoux 7750!), and my watchmaker cleaned under the bezel and did a pressure test - everything came back great and they said it was in healthy running condition and nothing looked like it was unoriginal.
Pics of my timegrapher reading, the invoice from my watchmaker, and the original crown:
