Mental Jewelry key ring from 1992 Options

[dangum]

Around 20 years ago I purchased this item on eBay. It's a metallic key ring that is stamped with the date of a show from the Mental Jewelry Promo Tour (February 20, 1992)

On the Live Lounge tour history page there is no mention of this date.
http://www.fansoflive.com/tour/history/1992/

I've never seen once since. Does anybody else have one of these? Does anybody know the history or story behind it? Did other shows also get a key ring produced?

Here's a picture.