NOS Horstman clutch... I forgot I have another clutch to my collection. Made around 1980 or so by the Horstman MFG. CO, INC, Monrovia, California. I have two of these... Both new never used... I was going to put this on my mini-bike but I changed my mind, I thought "how many am I going to come across one of these again." So I installed a new Max-Torque instead... I know nothing about this company, I can tell you it's well made and heavy duty. That's all I know. Any information about this or other clutches will be helpful.
The reason I posted my collection of mini-bike, go kart clutches is a reference for someone in the future who needs the information.