Dave has helpfully posted a pic of his with the T either side of Swiss Made, denoting the presence of Tritium (a type of luminous compound that's slightly radioactive) on the dial.
Modern service dials have luminova or superluminova instead, so no need for the T warning for the Tritium, they tend to just say Swiss Made, instead.
Some dealers in London are asking £2k for these... which is... optimistic, to say the least.
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