The tiny volume is bound with limp leather known as red moroccan, which I now know to be the technical term for goat skin.
It features gilt writing on the front cover (also known in the rare-book trade as the 'top cover') and on the spine.
You can see that the cover reads smallest French&English Dictionary.
Importantly, the book itself comes in a purpose-built locket made for portability and protection. This case will be the reason that this book as remained in such pristine condition these past 120 years. Ironically, the tin – a metal – has seen much more wearing than the book, made of mere paper.
So, here it is in all of its glory. The smallest dictionary in the world (1890).
The publisher information reads, 'Glasgow: David Bryce and Son. [All rights reserved.]’
Dimensions: 1 1/8" (27mm) x 3/4" (20mm), 384 pages set in 1-1/2 pt type.