Rolex

dedestexhes
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This is Google’s answer

A California dial is a watch face featuring a mix of Roman (top) and Arabic (bottom) numerals, originally called a "high visibility" or "error-proof" dial to aid legibility for military divers in the 1930s-40s. The name "California" arose later in the 1980s due to a California company that specialized in refinishing these specific, popular vintage watch dials.
Key Reasons for the California Dial Design:
High Visibility/Readability: Created to ensure maximum legibility for combat divers in low-light or underwater conditions by using distinct styles for the top and bottom halves of the dial.
Easy Orientation: The alternating Roman/Arabic numerals, usually paired with a prominent triangle at 12 o'clock and baton markers at 3, 6, and 9, helped divers identify the top and bottom of the watch instantly.
Patented Functional Design: Rolex patented the design in 1942 for its high-visibility benefits.
Art Deco Influence: The design was influenced by 1920s-30s Art Deco and Bauhaus styles, creating a unique aesthetic.
The California Connection: The term grew popular in the 1980s when a California dial-refinishing company, notably Kirk Rich, handled a massive influx of these refinished watches, leading to the nickname.
Hope this is the correct info,
Dirk