For me that was one of the late 70s Terran Trade Authority books.
I never saw any of Franz Joseph's books. I guess I lived too far from a major city, or maybe I was just too young: by the time I had my own money to spend on stuff like tgat, all I could find was FASA books and Starfleet Battles. So I knew the Technical Manual's children, but never met the parent.
For those who don't know, the TTA books ... well, the one I got was the first one: Spacecraft 2000 to 2100 ad. It was a coffee table book kinda like a book about aircraft of World War Two, but what it was posing as history was stuff that hadn't happened yet.
In reality, the publisher owned rights to a bunch of paintings of spaceships they'd bought (mostly for book covers), and a guy wrote a little bit of text about what role that ship played in history (first commercial interplanetary vessel, first commercial vessel with a warp generator, most common enemy fighter of the war, least common enemy fighter of the war. That kind of stuff.).
Despite the fact that it was kind of obvious what it was, as many of the ships didn't seem to belong in the same universe, it was my first taste of something set in a fictional universe being played as a non-fiction work from within that universe.