Used Vivitar Metal Lens Cap 

Lens ID is 67.7mm. I have tested it on 67mm rim, and it is too small. Since it is slip on type cap. It should fit lens with 65mm rim. 

Cap has been used , But it is not damaged in any way, no cracks or dents. It has some scratches from use. This cap is fully operational and functions as intended.  I would rate it an 8, on a scale from 1 to 10.