Did see that now .That is expensive . How complete is that balance . Is it with bridge an all the other things . Only the balance staff cost £60 or $100. Can't you just by a new hairspring . If you now which one.
A "balance complete" describes a very specific part. This means the balance wheel, balance staff, roller table with impulse pin (jewel), and the balance spring
assembly. It does not include the balance cock or jewels. If you wanted a balance cock for this watch it would be another $200 or so.
Balance springs are not commonly sold by watch companies, so Omega does not sell these for any movement that I have seen. They don't even list the balance staff as being available for this movement, so if I had to restaff it, I would be relying on staffs that are available on the open market. There was a time when you could buy balance springs for a watch, and if you look you can still find them out there in lots and assortments, but just buying the spring is really not going to help someone who is not
very experienced. Unless you have the knowledge/skill to select correct pinning points, form the regulator sweep (dog leg), know how to vibrate the spring to the correct length, and then be able to pin it to the collet and stud....let's just say this is advanced watchmaking that very few people do day to day, and certainly not really hobbyist level work.
Even if you were able to buy the balance spring assembly (collet, spring, and stud all mounted and ready to be installed on the staff) the chances you could remove the old one and get this one installed without damaging it would be slim I expect. While this is pretty simple work for most watchmakers, there are so many things that can go wrong when doing this kind of work, the probability of having a problem that you are unable to fix is pretty high.
I'm not sure why this particular watch has a messed up balance spring, but if it was already damaged when the watch was bought, I think this is a lesson learned as to why it the watch was not very expensive.
Cheers, Al