Caliber 7750. 144 / 10.300 dial fastener. 161 / 80.400 centre tube. 1491 - Oscillating Weight Bolt. 255 / 31.046 hour wheel. 705 / 30.040 escape wheel. 2611 / 63.035 jumpers spring. 5121 / 10.058.01 screw for balance bridge.
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