It's an eta 7750 based movement, if not actually a 7750. Almost anyone can work on it. I'd look for someone with an Omega parts account preferably.
Omega and ETA are owned by the same company, and many Omega's from that period are based on ETA movements.
Since 1973, the 7750 and its variants have found homes in IWCs, Montblancs, Panari, Omegas, Breitling, Sinns, Fortis, Tudors and under dials bearing just about every other name you can think of.
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