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I'm very much an optimist but that hairspring is done. An extremely skilled watchmaker might get it "tickable" after some hard hours of work but it will never look right or keep time correctly again. Almost all companies bought their hairsprings from a few main suppliers. Others bought the escapement and balance complete from a supplier; here the basic escapement parts like wheel, fork and roller table were likely from an established "set" but the pinion, arbor, and balance staff as well as balance were often unique to a caliber or few calibers. Even two watches of the same caliber made the same day could have utterly non-interchangeable hairsprings. In some cases with careful reduction of screw weight or addition of timing washers a hairspring can be adapted. Sometimes theres a little extra bit of spring that can be slipped out at the stud or a little can be taken in. Generally it's just easier to vibrate a new spring. Which brings up the fact that raw springs are scarce and no new raw springs are available (unless you buy many of the same CGS).

This one has sat in the "one day to be fixed" draw for years. Well the day has come! 1979 Pepsi "Q"

Could be a dozen things, what have you checked?

Check the period over which it occurs. If it’s 60s then check the 4th wheel as suggested, but I think it would be more likely to be the CS pinion if it’s a Cal 564 with indirectly driven seconds: polish the shaft of the pinion and inside the centre wheel.

Agree with oldhippy. In most cases when a watch is running very fast it is a fault that is causing the hairspring to be too short.

First of all I would demagnetise the watch. Remove the balance and clean it in some ronsonol lighter fluid. You might need to just demagnetise the balance again. You can test to see if the hairspring is clean and demagnetized by lightly touching the hairspring with your tweezers or a clean free from oil oiler; just make sure they are demagnetised. The same goes for any tools you use on watch movements.

This could be an eccentric 4th wheel, I didn't time it but the cycle seems close to a minute. Perhaps a bent pivot, perhaps damaged pinion leaves on 4th wheel. I don’t know this movement but if it is central seconds with supplemental pinion at center it could be bent and rubbing in center tube, same if ghe 4th wheel itself is central.

This is the watch I am wearing today. My son bought it for my birthday just the other day. Really like it. I changed out the watch band.

one day i am going build a clean room.with a suspended work station and a funnel shaped floor.