Specifications:

• Celo Calborn chainring
• 52t
• 144mm BCD
• Built for Calborn through Colnago, possibly by Campy (unable to confirm)
  
• Silver
• Pantographed Celo Calborn logos
  
• Rare Celo Calborn chainring in preowned condition! Has quite a bit of wear and some marks from use (see photos)