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It may have a two-piece barrel-arbor. That means that in order to remove it from the bridge, you must unscrew the sides of the arbor. That's what I had to do do on a Vacheron that I worked on recently.
When oldhippy wakes up, he may tell you that the arbor has left-handed threads, so be careful, and don't proceed until you know. You can snap the square off the arbor. Sorry to say, but I have done it.
If you indeed got as lucky as you think you did when you pulled the balance, it was probably because there was very little power left in the mainspring. All's well if it ends well. Good luck with the watch.
For movements with capped 3rd and escape wheel pivot jewels like Seikos Orients Rolex etc, which oil should the one for 3rd wheel be lubricated with? Only documentation I can find/have access to for such scenario comes from Seiko and they specify oiling the capped pivot with thin oil, but the uncapped dial side pivot with thick oil. Then again they also specify oiling the pallet pivots so I'm a bit unsure how religiously I want to follow their instructions. What is the commonly accepted practice here? Thin oil or thick oil?