This Yankee Stadium with Ruth card showed up 10-15 years ago. I first noticed it about 10 years ago and mentioned it in the newsletter I was publishing at the time. I've tried to attached a PDF of that issue to this post but couldn't (to large) it includes images of several other fake baseball theme postcards and how they were spotted. If anyone would like me to email them a copy just drop me an email request.
jsrna@aol.com
I've also noticed "fake" real photo postcards over the past couple of years, the backs are rubber stamped. Jim