Seiko Hi-Beat 2406-3020

This 1973 Seiko Hi-Beat, reference 2406-3020, places a green fumé dial inside a rectangular steel case. Its 23-jewel automatic caliber 2406 runs at 28,800 beats per hour, with a day-date display and finely stepped central seconds. An original Seiko-signed mesh bracelet continues the case’s straight, geometric lines.

Green fumé and high-beat mechanics

The green dial fades from a saturated center to a near-black perimeter. Polished applied batons and a fine outer minute track sit over the gradient. Seiko and AUTOMATIC appear above, with 23 JEWELS HI-BEAT below and a day-date window at 3.

Slim faceted baton hour and minute hands mirror the markers, and a needle-like central seconds hand reveals the closely spaced steps of the movement. The dial retains crisp markers and attractive color, with light age-related character.

Caliber 2406 is a 23-jewel Daini-developed automatic with central seconds, quick weekday/date indication and shock protection. Its 28,800 bph rate is equivalent to 4 Hz. The self-winding mechanism places this compact high-beat design among automatic vintage watches.

Rectangular case and signed mesh

The steel case has a broad horizontally brushed top, polished chamfers and reflective flanks. Its tank-like outline links it to the geometric experiments of 1970s vintage watches. Measurements are 28 mm across, 38 mm from lug to lug and 19 mm between the lugs.

A flat or very slightly curved crystal rises above the case. The fine coin-edge crown at 3 appears unsigned. Straight bracelet end links meet the case, followed by a tight Milanese-style steel weave that tapers toward the clasp.

The original mesh bracelet is Seiko signed, retaining a component signature relevant to this example among vintage Seiko watches. Its flexible weave gives a different wrist feel from solid articulated links.

Condition and servicing

The watch is used, with age-consistent wear and defined transitions between brushed and polished surfaces. Original case, dial, hands, bracelet and movement are retained. It is fully serviced and fully operational, includes a 12-month warranty, and is available for worldwide shipping.