Patek Philippe Calatrava 3820J Silver Dial Applied Breguet Numerals in 18k yellow gold with Original Certificate of Origine nylon-straps The white dial has a

The white dial has a railroad track within the edge of the dial

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This is the same "T" found on British military-issued Rolex Submariners (known as MilSubs)

This Wittnauer chrono comes on the pictured Bulang and Sons strap

screw down case back

Patek Philippe Calatrava 3820J Silver Dial Applied Breguet Numerals in 18k yellow gold with Original Certificate of Origine nylon-straps The white dial has aPresented in 1932, amid the challenges of the Great Depression, the Patek Philippe Calatrava Ref. 96 signaled a new direction for Patek Philippe. Drawing clear inspiration from the Bauhaus doctrine of form follows function, it became the firms first serially produced wristwatch and introduced a restrained, contemporary aesthetic at a time when ornate pocket watches still dominated. Named after the 12th century Spanish Order of Calatrava, it has since