For once I'm going against the tide here. If it was my grandfather's watch I'd take it to the Omega Boutique at 179 Collins St.
(Note:
Unless you can find a local watchmaker with an Omega Parts Account. If they don't have that they may struggle to fix any problems encountered).
Omega have all of the correct spare parts required and can return the watch to original condition.
The cost of the service (about AUD$650) will far outweigh the value of the watch, but it's not about money.
You will have a watch that works and has a warranty period on the serviced parts.
https://www.omegawatches.com/custom...s-and-prices/main-steps-of-a-complete-service
Lastly, take off that flexi bracelet, the spring loaded tabs can wear the lugs, get a nice leather strap and enjoy wearing it.
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