Did California also use the '52 corner tab in 1952 as well?
The '50 tab was actually on a '47 full plate (also used tabs for '48 and '49.)
California issued a full plate for '51, and tabs to go on it from '52 through '55. In '56, they issued new plates then went with stickers for renewal for the next few years.
Here's an interesting web site for plates from all sites.
Link