The users named Vaccum and "14060 or 16610?" are both trusted watch technicians in CONUS who are qualified to service/repair 7750 movements, which are very complex. If you bring them to "just anyone" for service, you are playing Russian roulette.
An excerpt from the services FAQ (posted publicly. nothing confidential here):
2) Flat fees for full service:
..........$100 - ETA 28XX and clone movements (non-GMT)
..........$100 - 6497-type movements (non-chrono)
..........$175 - Standard A7750 (running seconds at 9, no subdial modifications).
..........$195 - Modified A7750 (running seconds at 3 or 6, or any other subdial modifications (eg. 30-minute counter at 3). Seconds-at-6 gets graphite treatment).
..........$215 - A7753.
..........$215 - Modified A7750 with running seconds at 12.
..........$225 - TAG Grand Carrera movements.
..........$225 - Breitling big date movements.
..........A S K - gen Omega, Rolex, Breitling, Seiko and other movements.