CITIZEN Logmaster Ref.52401-TA

— A calculator in a circle —

The 1960s, when an electronic computer was still a very large machine. What Citizen entrusted to the Logmaster was the remarkable ability to work equations at the wrist.

The inner bezel, operated by the crown at two o'clock, is a slide rule you wear. The way it produces speed and distance still carries its engineers' appetite for the future.

— Silver in conversation —

A hairline-finished silver dial changes quietly with the light and draws a sharp contrast against the black slide-rule bezel.

Raised baton markers and sharp hands carry the design philosophy of Citizen's best years, where usefulness and looks were resolved at a high level.

— Calibre Citizen 6400 —

A dependable 23-jewel automatic movement. The PARAWATER title on the case back represents the company's confidence in its water resistance at the time.

Half a century on, the mechanical appeal is intact.

— Intelligent elegance —

The slide-rule graduations seen through the warm plastic crystal offer the pleasure of operating something — which no digital watch provides.