When I was a kid way back when I had a tiny book. It was miniature. I think it was a bible.
I seem to recall it was a key ring, hundreds of paper pages and had metal covers. It may have had a clasp too.
Its mixed up in my memories with a tiny fold-out concertina 'book' of holiday photographs I got one summer at the seaside. That may have been a key ring too.
Does any of this ring a bell with you readers?