I don't use the word "rare" too much, because I know what it means (or does not mean) regarding chips.

The ivory "50" I have on eBay isn't in anyone's collection except mine. There is only one other large ivory "50" poker chip known and that's in Dale Seymour's book/collection. I bought two of these from a person in New York State that was thinking of listing them on eBay.

The chip is in excellent condition (whatever that means). It also received a $1000.00 bid today.

This is it: It's 1-7/8" in size, and I'm keeping its twin.