Needed Updates to the Football Uniforms / Field The double-font logo first appeared around 1993. I don’t know the specific history but prior to that time the university seal or the Block CA were used across campus. It timed with 3 things - several other UC campuses were also developing wordmarks, an overall trend among universities to separate academic and athletic wordmarks/logos, and word processing becoming commonplace over typewriters for communication. The font has actually been updated slightly a couple times since.
The C-Horse logo was designed in 1999 by a committee of about 30 working with a big shot New York branding company. In 1998, Men’s Basketball won the D2 national championship and to the chagrin of many a “Cal-Davis” banner was hoisted by the NCAA. It was determined that the brand was too inconsistent given that even the NCAA got it wrong. Each team was kind of doing its own thing with some sort of CA or script Davis and a mishmash of attempts at mascots and logos, mostly cows and water towers. Gunrock hadn’t been a thing since the 1920s but was resurrected into a costumable mascot as part of the unified brand. There was tension though, as rowing and the Band-uh were committed to the Block CA and baseball I believe to the Lemon CA.
I don’t know the history of all the logos, but I do know the band wore mostly hand-me-down uniforms from Cal through the 1970s so the “A” was added by hand to the Cal “C”. Wouldn’t surprise me if athletics was also getting some secondhand equipment in the era.