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Old 23 August 2009, 10:22 PM   #1
Czechman
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Crown coronet variants?

What's the significance of the different marks directly below the coronet on Rolex crowns. So far I've seen them with a "+", "-" and "..."
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Old 23 August 2009, 10:28 PM   #2
Alcan
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On newer crowns, the number and type of dots under the coronet indicated Twinlock or Triplock, and the watch material.

Acero = steel
Oro Amarillo = yellow gold
Oro Blanco = white gold
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Old 23 August 2009, 10:47 PM   #3
mike
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"+" indicates a Brevet crown. Brevet means Patent in French. The marking and verbage was common in the 50's. Later Rolex dropped the word but continued to use the "+" for a while (I think around 1958 or so) untill switching to the underline on the crown indicating twinlock.
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