Omega Tuning Fork 198 question

I’m very new to the Omega 198 line of tuning fork watches although I have a Bulova spaceview in my collection. Recently I have taken a bit of a dive into this line with a very nice a fully functional example in hand (and on wrist). I have also taken a few flyers on non working models recently when my low offers make sense to the seller.
The first and likely most beat up of these arrived today.


I had no expectations that this would be a functioning watch and purchased with the thought that it would be great for parts and to try my hand at polishing a crystal. So DOA was expected and delivered.
What I didn’t expect was to see a 343 battery in it as the battery I had read about and seen mostly on listings was the renata 344. The 344 you see is one I installed.
There is no movement of the hands but I do hear the hum of a tuning fork after the 344 went in.
The hands move freely as does the date - but when advancing the second had spins very quickly.
Curious if there are thoughts on a very novice watch collector with tools and ambition to fix but little experience could fix this issue. I have heard these movements are tricky - but with four in the mail from Japan with various states of function disclosed and to be found, I’m very curious on thoughts of whether this is a new parts watch for me or if this is fixable.
FWIW, after confirming that the hands don’t advance I have removed the new 344 battery.
Thanks so much for your insights.

Hello.

EDIT = Sorry, I missed the point but let it speak for itself. Okay? Thank you.

Maybe this YT-video help.

Surely its a "Lobster" but its about the movement, right.


Kind regards
Smilla

Thank you all.
My other package was delayed in Japan (embossed leather band looked a touch like croc) so it’ll be a few more weeks before the next round of watches arrive. Direction being the better part of valor, I’m going to wait until four more arrive before I start to dig into the movements.
I was able to find a pdf of a service manual, so at least some progress.

Im no expert and im not saying this will fix yours or maybe a good idea but this fixed mine
I purchased this as non working
With same situation, hands and date all moved freely and was humming as should just no movement from the second hand or all hands . With all coil watches they make a small amount of magnesium attracting very small amounts of metal often when removing the case back getting stuck around the coil stopping the forks from vibrating properly. Have a good look around the coils as the forks do vibrate at very high speeds and are sprung. Here’s where it gets dodgy and fixed mine. With a soft wooden toothpick I placed in between the metal forks one at a time and gently pinged them pressing in and at the same time pulling out so it made them vibrate manually
And after a few goes jumped mine into life
I only paid £135 so I didn’t have much to lose if I couldn’t get it running as I knew I could just sell it back on for more then I paid

What’s this ??
Just be very very careful with touching the coils as the thin wire is very delicate
even just a very small amount of metal fragment will cause it to not run correctly

Almost wondering if a bit of compressed air is needed to clean out the coils? My example was admittedly beat to hell (but with a nice dial face).

And thank you - great eye. I’ll take a peek under magnification later.

I just took a deeper look at the movement while I was swapping two other 1250’s. Seems it is the index wheel. Given the need for a microscope to adjust after replacement I think this may be a repair I will wait on or use the other side of the movement for donor parts if needed later.

Even with a microscope, adjusting the timekeeping after changing the index wheel is quite tricky, as even the smallest adjustments can have a big impact. There are special timegraphers that can help you with this, but they are rare.
Also getting your hand on an NOS index wheel is not easy. Buying a NOS ETA-ESA 9162 and using that for parts was my way of tackling this. After quite some time of trial and error I got the movement running precisely, but can indeed be a troublesome process doing it the first time.

So true. I’ll replace a coil, a day or date wheel, but I’m not going deep on these movements especially when there are specialists around with the right tools. There is a half of this movement which is largely a no go area for me given my current skill set.