WS 9: Replacing the main spring of a Rolex Caliber 1570
Someone must have been working on the gear train. The circular scratches on the gear train bridge indicate that the hole jewel might have been replaced. Do not forget that you are looking at the movement now as it might appear with at least 10 times magnification. And now you can see, the hairspring does not oscillate and you can also get a good look at the screws that also regulate this caliber. Also one pallet stone is nicely visible. A bit below the line of the two shock protection assemblies. One of the shock protection assemblies is on the balance, the other at the top middle of the picture. Nice that the screw slots have not been butchered. Just makes a movement look sloppy. At lower right picture corner you get a good luck at the winding pinion or sliding pinion. One one side it connects to the castle wheel to allow setting of the watch and at the other end it connects to the winding pinion that allows this movement to be manually wound.
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