Seiko Moonphase (35mm, Quartz) – Ref. 7434-6020 [Extremely Rare Hexagon Case]

The Seiko Moonphase Ref. 7434-6020 is one of those elusive vintage pieces that seamlessly blends elegance with intrigue. Featuring a 35mm hexagonal case, it stands out for its geometric precision — a bold yet refined design rarely seen in Seiko’s quartz lineup of the early 1980s.

The dial captures classic sophistication with Roman numeral indices, a gold-tone outer bezel, and a beautifully rendered moonphase complication at 12 o’clock — a poetic reminder of time’s celestial rhythm. The date window at 6 o’clock balances the composition, while the warm ivory dial and golden hands lend the watch a vintage charm that has only deepened with age.

Powered by a Quartz movement, it offers reliability alongside vintage flair, making it ideal for collectors who appreciate both mechanical artistry and daily practicality. The pairing with a green textured strap adds a unique character, giving this watch a touch of eccentric elegance.

Key Features

• Reference: 7434-6020

• Dial Size: 35mm

• Movement: Quartz

• Case Shape: Hexagonal with rounded edges

• Dial: Ivory with Roman numerals and moonphase indicator at 12 o’clock

• Date Display: At 6 o’clock

• Case Material: Gold-tone base metal with stainless steel back

• Strap: Green textured leather strap

• Era: Circa early 1980s

• Rarity: Extremely rare configuration and case design