Mickey Mantle autograph signed to my brother at a trade show in 1972 or 1973

I came across this website when I was trying to look up a value of this Mickey Mantle autograph signed to my brother at a trade show back in 1972 or 1973. Any thoughts?

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Comment by Brad Zirlin on September 8, 2019 at 12:26pm: Thanks for the all the comments. I listed it on eBay as a Buy It Now. The asking price may be a little high, but we'll see if there is any interest. https://www.ebay.com/itm/254353156457

Comment by tim hendrickson on September 9, 2019 at 5:10pm: I love that piece as is....the more mickey mantle wrote, the more it would mean to me.....what is interesting also to me is that in the early 70s that a company would bring in a superstar (thats probably not unusual) but he signs cards that already say the card was signed at that show....a pre cursor to a COA ? I don't think i have ever seen that....i imagine that most times, some superstar guest would just sign a picture or event program....