Other advancements were also being made to improve the durability of
the wris****ch. The faces were replace with ones made of synthetic
plastic. This made them much more durable and resistant to breaking
and cracking. Another advancement was in the dials. The dials were now
being made out of metal.

Another advancement in the wris****ch was the self winding watch.
Rolex introduced their self winding wrist watch in 1931. The design
must have been good, because it is still being used in wris****ches
today.



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