Chronology of call letters CYZ

First station

• Date: ...March 1925...
• Frequency:
  • 750 kHz (...March 1925...)
• Location:
  • Mexico City, Mexico (...March 1925...)
• Owner of license:
  • Liga Central Mexicana de Radio (...March 1925...)

Second station

• Date: ...January 31, 1927...
• Frequency:
  • Unknown (...January 31, 1927...)
• Location:
  • Tampico, Mexico (...January 31, 1927...)
• Owner of license:
  • Manuel Guzman Willis (...January 31, 1927...)