Miller Blues Band postcard handbill from 1967 from Mouse studios

This 5 x 7 postcard handbill is from Mouse studios and was for Miller Blues Band concert with Mother Earth, and Bukka White on September 1st, 2nd, and 3rd 1967 at The Avalon Ballroom. I need to get a bunch of matching frames to display all these handbills I have been buying lately, any tips on proper preservation and framing of these postcard handbills?

The enlarged section is from below the angels toes, above the 123