oops forgot the link
I honestly do not believe Maris did any card shows. I am attaching photos of three Maris autos that I possess. The one on the team ball is from 1961, and shows his "second generation" signature. there was actually an earlier variation, that if you look at KC or Cleveland team balls from the late 50's, you will note the differences.
The other two here were obtained by me, directly through his Busch distributor ship in Florida around 1979.
As for what I don't like about the Maris in the photo, the first thing I look at is the capital R in Roger. He typically started the R with a straight line moving upward. In your photo, it starts to tilt to the right. This is a common flaw. There are other things that concern me, including the closing of the "a" in Maris, the formation of the small "r", and the size of the small letters in Maris compared to the ones in Roger. In my authentic examples from his later signature, the letters in Maris were marked larger than the ones in Roger. Look at the "o" vs. the "a". Hope this helps!
Maris did a card show in the early 80's in Springfield Illinois.
I have Maris on a baseball, with a handful of other teammates of his.
I bought it for $300 from a big auction years ago, simply because I thought it would be a good investment. If anybody is interested, let me know (i'd have to find it, but would if somebody offered me a right price).
email me: email@example.com