see also 劳力士 1941 年的专利 | CH221643A - Cadran de pièce d'horlogerie. - Google Patents https://patents.google.com/patent/CH221643A
watchOS 6 里 California 表盘的来源：
In the 1970s, when the vintage watch boom started, a LA based dial refinisher, Kirk Rich, did some dials with this design. They became popular & many vintage watch stores in California sent their dials to KR. So dealers in the rest of the US & the rest of the world began to call them the 'California' dial.
“Around the late 70's early 80's customers would ask us for the ‘California dial’ when requesting a refinish. Basically it was because it was easier than saying "Roman Arabic" when describing the mixed number printing. Roman numerals on top with Arabic at bottom. We were pushing a lot of these so much that people from all around would just ask for the California dial when sending us work.”
| A Brief History of the California Dial — Timepiece Chronicle https://www.timepiecechronicle.com/features/2017/1/4/a-brief-history-of-the-california-dial
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请知悉本文自写作或上次更新已届相当时限，或包含过时信息及观点。