Babe Ruth Farewell Speech 45

Hi everyone, I was looking for a little help on the value of this. It's an old 45 one side stating it is Babe Ruth's Farewell Speech in Yankee Stadium, the other side listing as a recording of Mad Ruth/The Babe by Danny O' Keefe copyright 1973 by Atlantic Recording. It states it's a Promotional record and Not for Sale as shown on the picture. I've been trying to research what a potential value on this would be but even google isn't helping. Any input is greatly appreciated. Thank you