Specimen of Type Faces in the United States Government Printing Office
The pattern
This still is filed under Specimen as proof.
Define
A specimen (type, material, finish) is shown so the product proves itself under comparison.
Mechanism
Controlled display. Same conditions, side by side, no adjective required. The sample is the sentence.
Verdict
Buyers choose by eye or by hand and we can put the real thing in front of them.
Why it works
The ring binding allows for pages to be added or replaced (as stated in the preface), and the heavy textured cover ensures durability in a working environment.
Steal this when
You are designing a living manual or catalog that must survive heavy workshop use and frequent updates.