The hairspring looks ok in the first photo you posted. It that is concerning if the regulator causes excessive change when only moved very slightly. Better quality movements have longer hairsprings generally, which permits finer regulation. These hairsprings are reasonably long.
If you really wanted to, you could mount the hairspring alone on the cock and check that it looks right in terms of alignment with the jewel hole. Getting the terminal radius corrected can be tricky, but yours at least looks consistent.
In terms of your timing variations, the effect is being exacerbated by lack of amplitude. Don’t let this allow you to jump to the conclusion that the balance is out of poise. Get the amplitude up and see where you get to. I think your pendant positions are possibly showing excessive drop in amplitude. Given that this movement has been mucked about with previously, check the balance pivots aren’t bent, even though it has an antishock setting.
Here we go with another possible lot of 15 comprising.
Ruby De LuxeOlma SportForlisMovadoRotaryBintimaCitizenParaNelsonUnitasRoamerTip TopAncre GoupillesTitan
Anything here worth repairing with a view to keeping or flipping?
I get a watchmaker to sort out most of my purchases. If its just a battery issue, strap or general clean I can do that, but I'm not up to the delicate repairs yet
My Name is Eugene and I am a watchmaker located in Atlanta, Georgia .
I was full time software engineer and part time watchmaker since 2000.
in 2019 I quit my day job and now my wife and me full time servicing watches.
Dream come true!
Stripped, cleaned, and lubricated again. When I originally got it, there was a small kink in the spring near the regulator, which I was able to decently fix I think. I examined it again today, and it looks like the terminal curve might be off, which I imagine is what is causing such significant timing changes when I try to regulate. A hair adjustment will easily make a 30 second change, but I dont know if that is normal or not. Photos attached.
Dial Down: +1 254° 0.2
Dual Up: -7 236 ° 0.2
Pendant Right: -24 184° .1
Pendant Left: -31 194° 0.0
Pendant Up: -46 183° 0.2
Pendant Down: -23 191° 0.0
Dial Up again after: -3 238° 0.0
Time grapher at 44° and averaging on 20 seconds.