In an ebay search I saw several of these, but unfortunately no helpful information. Most note it as a 1991 card which makes sense based on the back but they really could have been produced at any time. I expect it is an unlicensed card that most would say does not belong in the database. I'm really not sure how you would list it without brand etc.
One ebay seller has a lot of 100 of these available.
http://www.ebay.com/itm/100-ODDBALL-NOLAN-RYAN-CARDS-300-WINS-Texas-Rangers-HOF-pitcher-/382176642401?hash=item58fb80c561:g:ocMAAOSwQupXUtD7
Similar to other unlicensed there is really no way to know print runs. Could have been done out of someones basement. All of the ones I saw have white back but where they could have printed whatever they want I doubt either version would be considered rare.