Other Recommended book

The Encyclopedia of Spring Air Pistols is the best available. There is a Youtube video about the book by the author John G. I can have him send you a copy from England it's about $100.
Randy

With several chapters on vintage air pistols, The Manic Compressive is a treasure-trove of what you're looking for; including velocity and accuracy testing, model dating, production numbers, and hunting with vintage air pistols. But since it's been out of print for a quarter-century, you'll be lucky to unearth one in all of Cyberspace.

Here's the table of contents, virtually every chapter including vintage air pistols information-




However the same author's latest book is still available on Amazon, and also includes a lot of vintage air pistol information-



Table of Contents - Page 1
It Started a Long, LONG Time Ago - Pages 2-3
Airgun Zealot on the Loose! - Pages 4-8
Air Pistol Sights, Insights and Incites - Pages 9-16
Vintage American Classics - Pages 17-23
Euro Classics - Pages 24-31
Life Beyond Ten Meters - Pages 33-48
Precharged Pneumatic Pistol POWER - Pages 39-44
Czechmate! - Pages 45-51
A Magnum Air Revolver? - Pages 52-58
“This Little Baby’s a Reeeal Tack Driver!” - Pages 59-74
Air Pistol Conversions - Pages 75-83
Rimfire Versus Air Pistol Accuracy - Pages 84-91



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This one by DT Fletcher should be right up your alley. There is relatively little text, mostly it's 300 pages of factory catalogs, instruction sheets, drawings, etc. (the two recommended above are both fabulous, but of course the Encyclopedia of Spring Air Pistols has nothing on Benjamin's pneumatic and CO2 guns).

Also OOP and probably kinda hard to find, unfortunately.