Rolex 1530 serie: 1560 1570 ... part: loose upper or lower jewel for the driving wheel(#7919)
see #7918 for the upper jewel

... functional, as pictured ...

lower jewel measurement:
diameter of the stone 1.11 mm
diameter hole 0.52 mm
thickness 0.29 mm

Good Luck,

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14 business days upon reception