Below is a list of all the parts for the very popular movements: ETA 2801-2, ETA 2804-2, ETA 2824-2, ETA 2836-2, ETA 2834-2. This collection should give you a good reference for each ETA watch part number. #100 Main Plate. #105 Barrel Bridge. #110 Train Wheel Bridge. #121/3 Balance Bridge for Regulator. #125 Pallet Bridge.
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