Pre eBay it used to be considered scarce and would sell for over $1000. Now it is easily the most common vintage Ruth card IMO.
I have owned about 15-20 of them over the years, and many of the books with glued sets too.
PS.
The Astra back variation is actually a rare card.
http://cgi.ebay.com/Super-RARE-Babe-...mZ190363499380