Bash guard ID???

[Fat Tire Trader]

When I have time, I will look for mine. I remember that I had to cut away part of it in order to fit on my Cook Bros cranks. It was so long ago, I don't remember the name of the manufacturer. It might be the same, probably is, mine is black.

 

[joglo]

The cut outs are just to fit more easily to different crank sets.

The Crystal Design chain ring guard came in different variants, also for compact and standard BCD.
This is from 1997:


And here is an advert, already from 1992, showing also one with out any cut outs at all: