Canon Dioptric Adjustment Lens S -4 Diopter for A-1 AE-1P AE-1 AV-1 AT-1 V23

This vintage Canon Dioptric adjustment lens S -4 diopter is for use with Canon A-1, AE-1 Program, AE-1, AV-1, and AT-1 cameras. It shows no sign of use and it comes in its original box.