I have one just like it. I found it on CL for $25. Of course I had to drive 120 miles to get it but it was still a great deal. Mine had most everything included. I had to replace the bobbin winder tire and I do believe I need a new belt because it does slip a little at times on takeoff and I can't seem to tighten the hand wheel tight enough. To be as old as it is it is in wonderful shape.
I haven't tried the cams yet. I have never sewn on a machine that used them and I guess I want to get really used to it before I try them out.
I haven't been able to find much out about the Tri Span 88's. It is a short shank which should help with getting any feet you may need. I am very pleased with mine. It is as heavy as a tank. I have even sewn leather with it. It went through it like a breeze. Good luck with it.
Vicky