PS. California plates have always been issued sequentially and I was always into cars and plate numbers while growing up - helped by the cars my parents and siblings purchased
If you give me the 1st letter of your blue/yellow combo, I can come up with an approximate year of issue. And whether it was a numbers/letter combo or the later single number, letter, number
The current 7 digit format of number, 3 letters, 3 numbers started around 1980. I remember it well because we were allowed to go to 7 digits for personal (vanity) plates and I jumped all over that. Around 1985 was the time we switched to the reflective white plate/blue number theme for personal plates. Normal plates were still blue/yellow. The white/blue combos for normal plates was sometime after that
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI