Bump.
Actually, I'm looking for a scan of the instructions/manual for maintaining a set of SGRs. I just picked up a pair in my on going geek-out on anything C-record (1988 or so).

I would appreciate it if any one could post a PDF or link.

And while I'm here, I'll add a few things to address the previous (although very dated) conversation:
1. Yes, the SGR cleats are compatible with any three hole shoes. They use the original Look standard drilling from ~1986-ish, and still in use today (2014).
2. SGR cleats can easily be found NOS on eBay and at reasonable prices - a bit more than Look Deltas, but not really that bad (just picked up two pair). I got them for $40/pair, including the original mounting hardware (new in Campy baggy).
3. Even a used pair of SGRs can be found at a decent price for any one else looking for some of that old C-Record gear that was as much artwork as it was cycle components.
4. Yes, they are very heavy for pedal, and a very stiff kick-out if they sit for two long.
5. There is a mechanism that gently holds them in place relative to the spindle, but once released (by kicking in) the spindles are wonderfully smooth - even on my ~30 year old set.
6. As I remember, the original 1986-1988 (??) retail price was around $800 (as memory serves).

As far as History - as best I can figure:
Campy was a toe clip hold out for a while - even after the clip-less writing was on the on the wall, they continued to market a collection of toe clipped pedals. But were slow to give them up completely. I assume they expected clip-less to be a fad (it was the 1980s - this was a natural reaction to just about everything).
Campy released the SGR - their own design at the beginning of the of the clip-less revolution in the late 1980s (when I was in high school, and doing the original build of the machine that I'm finishing now with the drool-over hardware: C-Record). Based on the success (or lack there of) Campy made the jump to using actual Look pedals. I have read that they were either made by Look with Campy spindles, or made by Campy under license. Either way, the 1990s era Campy/Look pedals are essentially look (delta cleat) pedals. Eventually (not sure when) Campy released their Pro Fit pedals, which have done much better than their SGRs, but are still on the pricey side (~$450 full retail for Record Pro Fits).

Fortunately, all Campy pedals, clipped and otherwise are still service-able, and can be mounted on modern cranks - one "standard" that has not yet changed. But as with any Look Delta pedal, the KEO cleats will not work with Delta cleat standard pedals - but the black and red (float) cleats can be bought off the shelf (just picked up a set of blacks for my old 1986-ish Mavic Look standard pedals a couple weeks ago at REI). The SGR pedal / cleats are NOT compatible with anything else I have seen.

And of final note, the adjusting bolt on the inside of the SGRs used either a 6mm Allen wrench or an 11 mm open ended spanner. There is an inner tensioning bolt (forget the size, but it requires an allen wrench). I was actually hoping that something on these pedals would require a 3.5 mm allen wrench (a little Campy humour).

That should be plenty of info for any one looking at a set of SGRs. I'll have to update once I get them on my machine and put on a few miles.

~Monkey~