SEIKO Presage Cocktail Blue Moon Open Heart SSA405J1

SEIKO Presage Cocktail Blue Moon Open Heart SSA405J1

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An elegant dress watch from the Seiko Presage Cocktail Time collection, inspired by the “Blue Moon” cocktail. It features a deep blue dial with an “open heart” window, a 40.5mm stainless steel case, box-shaped Hardlex crystal, and an automatic movement on a blue leather strap.

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The Seiko Presage Cocktail Time “Blue Moon” Open Heart (SSA405J1) is an elegant, meticulously crafted timepiece inspired by Japanese cocktail culture, specifically the drinks served at sophisticated skybars in Tokyo’s Ginza district. This model features a beautifully textured, deep blue dial that mimics the rich hues of a Blue Moon cocktail. A distinct highlight of the dial is the circular “open heart” window at the 9 o’clock position, which provides a captivating view of the balance wheel oscillating within the mechanical movement. The watch is presented in a polished 40.5 mm stainless steel case, capped by a vintage-inspired, box-shaped Hardlex crystal that adds depth and a classic aesthetic to the refined design.

At the core of the SSA405J1 is the reliable, in-house Seiko Caliber 4R38 automatic movement. This 24-jewel mechanism offers a power reserve of approximately 41 hours and includes both manual winding capability and a stop-seconds (hacking) function for precise time setting. The intricate movement is further showcased through an exhibition screw-down case back. To complete its sophisticated look, the watch is paired with a matching deep blue calfskin leather strap featuring subtle stitching and a secure three-fold deployment clasp with a push-button release. With a 50-meter water resistance rating, the Blue Moon is perfectly suited as a versatile dress watch for both daily wear and formal occasions.

Basic Information

Reference: SSA405J1
Collection: Seiko Presage Cocktail Time (“Blue Moon” Open Heart)
Case Diameter: 40.5 mm
Case Thickness: 11.8 mm
Case Length (Lug-to-lug): 47.5 mm
Case Material: Stainless steel
Water Resistance: 50-meter (5 bar)
Movement Type: Automatic with manual winding capacity

Movement & Features

Caliber Number: 4R38
Power Reserve: Approximately 41 hours
Jewels: 24
Functions: Analog time (hour, minute, second), stop seconds hand function
Special Feature: “Open heart” dial window exposing the escapement

Exterior

Crystal: Box-shaped Hardlex
Dial Colour: Deep blue
Band Material: Calfskin leather
Band Colour: Blue
Clasp Type: Three-fold clasp with push button release
Case Back: See-through exhibition screw case back

Time Vibe