What a lovely reference!
Model from the 1950's with a 34mm case in yellow or white gold, sometimes referred to as "Calatrava Disco Volante".
Best to you all.
1/ SMALL SECONDS & BATON INDEXES 
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2/ TWO HANDS ONLY & BATON INDEXES 
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credit: wind vintage

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3/ TWO HANDS ONLY & ROMAN NUMERALS 
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