Starting to get moved into the new place. I promise, photos soon. I've finished refinishing the wood floor in the library. Unpacking a box of my things I haven't seen for a year, I found my album which houses my modest ex libris collection. Browsing amongst these treasures I found what I believe would vie for the smallest ex libris. I mean, it's tiny. I'm pretty sure it's a return address label that has been appropriated into a teensy, but affordable ex libris.
I began to think of smaller markings, like book branding, armorial stamps, other ink stamps, etc.--- but they aren't true ex libris. So, is it indeed the smallest? Probably not, I think another I've uncovered here was perhaps smaller, but a guy can hope.