Authentication is really a "Mini Contract" either created by an artist or an agent of the artist. When in volved with "Museum Pieces", that is a factor of 10 above lol. Simply a 2x3 card size statement mounted on the back that states that this is an original work by"_____".
The info also states the Name of the piece, the Medium, the year,  the # out of within a limited series, and a statement that includes the printing method and the life expectancy of that method.
Most of my prints are supposed to last 70-100 years, but hey, I'll never see that lol :) As this label is really a personal statement, I suppose that one could do a non archival piece with such a statement. If you look at famous prints from famous photographers and artists, on the back most often there will be an "Certifiacate" on the back, that most often were created by the artist.

And Kort, as to the "display card", thats where I still use foam core lol. Simple info with Artist, Medium, Size, # within edition and Price. Some galleries allow personal contact info, many will not.
But like all mediums, the better the presentation, the better the reaction and hopefully a big sale :)

This is a fun discussion!

Kurt