Rare Omega Genève - 18K Gold “Post Tenebras Lux” Engraved Watch - Help Identifying

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Hi everyone,


I recently acquired this vintage Omega Genève and would appreciate any help identifying it more precisely. A few things make this piece unusual, and I’m wondering if it might be a rare presentation or limited edition.
  • Model: Omega Genève
  • Year: 1950s
  • Movement: Manual wind
  • Case: 18K solid gold
  • Dial: Silver with inward-tapering hour markers (not seen on other Genèves I've compared it to)
  • Case back: Inscribed with "Les Services Industriels de Genève" (“The Industrial Services of Geneva”) and the motto “Post Tenebras Lux”
  • Sub-seconds dial at 6 o'clock
  • No box or papers, but in good working condition

From what I’ve found, this may have been a presentation watch given to Geneva public service engineers or retirees. The dial markers are especially interesting—unique and unlike the usual straight baton markers of the Genève line. I would like to know if it is rare and if it costs more than 2k.

Thanks in advance! 🙏
 
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Why do you believe it to be a Genève model? Does it have a corresponding reference number?