Speedmaster Professional
The hand-wound, NASA-qualified line — the original Moonwatch. The 42mm hesalite-crystal canon is the reference design; sapphire and "First Omega in Space" branch off without leaving the Professional spec.
The hand-wound, NASA-qualified line — the original Moonwatch. The 42mm hesalite-crystal canon is the reference design; sapphire and "First Omega in Space" branch off without leaving the Professional spec.