GMT-Master through the years

Rolex · 1955–1999

Calibre

3175: 1988–19993185: 1989–20053186: 2005–20193285: 2019–2026

Diameter

40 mm: 1988–2026

Thickness

12 mm: 2005–202611 mm: 1988–2005

Generations

Shaded: new to the line.