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The ring to indicate the drive side is a feature have not before seen.
Perhaps to assist a team mechanic working under lantern light following a day's stage...
You do not mention the model of your set. If OFMEGA brand, be it Forgiato, Competizione or Mistral? The Competizione model spindles I recall have a bit nicer finish so I was wondering if it might be a Forgiato set; a model have not had occasion to work with.
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