[CR]Meaning of "G" (as in good condition used)?

Hey all,

I'm kinda new to the marketplace of vintage stuff, and I was wondering if there were commonly agreed-on definitions for the conditions of used stuff, especially G and VG.

This is prompted by me receiving a used chainring I bought unseen. It was listed as "G" and I thought that meant in good riding shape, but it's got such worn teeth that I suspect few on this list would ride it.

I'd appreciate it if those of you with some extra time on your hands would go look at http://bulgier.net/pics/Our_Pics/Bike/WornRing.jpg and tell me what you think - am I too picky, or would you consider sending it back? Seller charged $20, which is a good enough deal for a SR 42 ring with miles left on it - would you ride it?

It's not a big deal, this is more out of curiosity about what other people's expectations are.

Mark Bulgier
Seattle, WA USA