This picture may be well known by others. It is the first time I have come across it. Since I do not recognize any of the suspensions, I thought it might interest some other collectors as well as myself. Should anyone be good enough to contribute information about any of these, I will be pleased to add it to the posting.
C,D,E, & F appear to all be straight caps.
"I'm almost positive specimens of Type D (multipart suspension) have been recovered by Spadafora and others in recent years, and I believe Type C as well. I do remember Type F is foreign. A & B are Hewlett disks, and Type E was just a 'typical modern' disk. Dave "