Hi there I acquired this sprocket at a auction lot. I really do not know much about it. There are no marks on it from any use just a few little scratches. Have a look at the pictures and decide for yourself. Going across the centers of the mounting holes are 5 15/16" and the diameter of the sprocket is 97/8" to the tip of the teeth. If you have any questions I will be glad to help if I can.

Have a good day