I got one of these like Rowdy's, only much much worse, and yes, Cindy gave me a good price. I should have taken a "before" photo because it was really really dirty and missing numerous keys, including spacebar. Fortunately, all the "special SSK" keys were there. Most keys were 1-piece, although the "J" was 2-piece even though it had the SSK sub-legends and matched its neighbors (and also "F"). I was disappointed when one of the missing keys was Left Shift, because those are always in short supply, but I happened to have a spare in my box after all.
The caps were so dirty that even after soaking in hot water with powdered laundry detergent and Oxi- for half an hour, I still had to physically scrub them. I don't think I have ever had to do that before, except on a rare random single key.
I was able to remove 98% of the permanent marker "Part of RISD 31346" (Rhode Island School District?) by 3 rounds of: (1) wiping hard with alcohol, (2) using my electric eraser with soft white strip, and (3) scrubbing with a plastic kitchen scrubber with the same strong detergent/oxi- combo.
I also tried the (occasionally effective) technique of going directly over the permanent marker with "dry erase" marker and then taking them both off together with a dry rag. That probably works best when the mark is fresh, and these were probably years (decades) old.
A bolt mod was in order (there was residue everywhere and the membranes were partially stuck together) and I will have it back together today. Although mine is a September 1987, I think that it has the "mid-weight" plate and not the heavy one.
Anyway, for an investment of just over $200 to Cindy and some dirty work, I now have 2 beautiful working SSKs!