Nomos Glashütte Tetra Tetra Die Unerreichbare / Closed Case Back

Reference 427

About this watch

The Nomos Glashütte - 427 Tetra Die Unerreichbare is a stunning timepiece that embodies the perfect blend of sophistication, precision, and luxury. Its striking silver sunburst finish exudes a sense of elegance and simplicity, making it a statement piece for any watch enthusiast. The square stainless steel case measures just 27.50 mm in diameter and 6.30 mm high, ensuring an incredibly comfortable fit for daily wear. At the core of this masterpiece lies the Nomos Glashütte caliber Alpha movement, a hand-wound movement that's revered in the watchmaking community for its exceptional quality and reliability. With a decentralized seconds hand, stop-seconds mechanism, and 17 ruby bearings, this movement ensures accuracy and durability. The Tetra Die Unerreichbare is a testament to fine German engineering, offering an attractive proposition for watch lovers who value elegance, craftsmanship, and practicality. Whether you're a seasoned collector or a newcomer to horology, this timepiece is sure to impress with its unique blend of design, movement, and luxury appeal.
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Key Features

  • Nomos Glashütte caliber Alpha hand-wound movement
  • Closed stainless steel case back for sleek aesthetic
  • Sapphire crystal glass for scratch resistance and clarity
  • 30 meters water resistance for everyday activities
  • Silver sunburst finish with mixed indexes for elegant design
  • Comfortable 27.50 mm diameter and 6.30 mm height for daily wear
  • High-quality movement with decentralized seconds hand and stop-seconds mechanism

Specifications

Brand
Nomos Glashütte
Family
Tetra
Model
Tetra Die Unerreichbare / Closed Case Back
Reference
427
Movement
alpha
Movement Features
  • Hours, Minutes, Small Seconds
Case
Stainless Steel 27.5mm
Dial Color
Silver
Crystal
Sapphire
Water Resistance
30

Current Listings

[WTS] Nomos Tetra ref 401 *priced to fly

Nomos Tetra ref 401 *priced to fly

Nomos - 401 · $825
Up for grabs is a Nomos Tetra 27.5mm with a solid caseback and that charming paper-like "beige" dial with blue hands.

  • Condition: Pre-owned/serviced in 2021
  • Diameter: 27.5mm
  • Weight: 28.5 grams
  • Movement: In-house Alpha movement
Posted at
Aug 20, 2025, 8:15 PM
Active
[WTS] Nomos Tetra 27.5mm

Nomos Tetra 27.5mm

Nomos - Tetra 27.5mm · $850
A Nomos Tetra 27.5mm with a solid caseback and beige dial, featuring the cleaner ‘Germany’ dial with blue hands.

  • Dial variant: cleaner 'Germany' dial
  • Production period: 2005-2010
  • Movement: in-house Alpha movement
Posted at
Aug 13, 2025, 9:54 AM
Active