Helvetia watch serial numbers5/28/2023 “Swiss Made” indicates use of non-radioactive superLuminova “Swiss” Reappears briefly around 1997 for a year or two to indicate use of non-radioactive Luminova (it should be easy to distinguish a 1950’s watch from a 1990’s dial though!) “Swiss T<25” Introduced around 1963 to indicate Tritium is used but emiting fewer than 25 milliCuries “T Swiss T” introduced around 1963 to indicate Tritium is used emitting fewer than 7.5 milliCuries At the bottom of the dial there are a few little signatures that can appear, the most common to appear on Rolex dials, in chronological order are: Namely the type, and power of the luminous material used. The first thing anybody looks at on a wristwatch though is inevitably the dial, and again, due to Swiss law, there is some surprisingly useful information to be gleaned from them.
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