M13 Disintegrating Metallic Link
Used with the M60, L7A1, L7A2, M240, MG1, MG3, H&K21, MAG58 Machine Guns.

In Canadian Service the M13 Link is designated the C1 Link. 

Markings:

None	Small	Large	NATO Mark
Marking	Photos Overall               Marking		Finish	NATO Mark	Hole Size	Notes
CI + IVI			Phosphated	Yes		Made by Industries Valcartier Inc., Valcartier, Quebec

Thank you to Ed Storey for the photo of this IVI marked link.