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Use a screwdriver instead of a pointy tweezer to depress the setting lever as this will prevent you pushing it too far. Pushing too far can cause the yoke to slip over the clutch wheel and then you need to do some dismantling to resolve that.

The key element is height & strength if it is to high it can bind on the barrel cover & if too strong it can cause the issue of over banking. Best to go under rather than over.

It would be worth trying as long as the thickness (gauge) is correct. Being slightly shorter it will fit into the barrel, but it won't last quite as long as the 380 would when fully wound.

Ok my "General Resorts" catalog shows Cal 5201-27 Auto GR No. 2637 Height 1.10 strength 0.11 length 380 dia.10 If this size matches the old spring or fits into the barrel It will not be far away from your requirements.

Inside!

Willing to bet good money the movement was lifted off of the back of the dial partially while taking out movement frame/ fitting new battery, the front of the dial pushed on the underside of the hands and upset them, with any luck the hands just need removing and refitting in the correct position. best get a watchmaker who knows what they're doing though, even on fashion watches, dial/hand work is delicate and there are 100 potential problems you need to mindful of.

Shouldn't it read SWISS MADE not SWISS?

Totally acceptable, as long as you state this if you sell it.

This video show the utter importance of always demagnetising a watch before attempting to regulate it.

Hmm... I'm a have to get one of those to use for the Timezone course. I also wish the Japanese or maybe the Germans would take the initiative. The Chinese are perfectly capable of quality manufacturing, but you never know what you're going to get. The TC 2824 may be very good quality, but the Chinese even rip off their own companies. So if I buy a TC 2824, is it the real one or a crap clone of a clone?

I don't think he did centre the piece when he glued it to the chuck. He positioned it as close to centre as possible by eye and then machined it true. Later in the video he did "catch centre" using a graver to provide a guide for the drill. De Carle touches on this in "Practical Watch Repairing" when he describes making a wax chuck for turning a balance staff. Excellent video though, great to watch.