Sinn

Founded in 1961 by flight instructor Helmut Sinn, the brand has established itself as a leader in professional tool watches. Their innovations include oil-filled cases for perfect underwater legibility and Tegiment technology for enhanced scratch resistance. The brand's expertise spans from pilot chronographs to professional diving watches, with collections like the U-series and 756/956 demonstrating their technical prowess. Each timepiece showcases their commitment to creating robust, functional instruments that meet the highest professional standards.

155
Watches
7
Families
30
Listings

Families

Classic Timepieces

Diving Watches

Frankfurt Financial District

Instrument Chronographs

Instrument Watches

Ladies Watches

Special Edition

Current Listings

[WTS] Sinn U50 T SDR Fully Tegimented ON Tegimented H-Link Quick Adjust Submarine Steel Bracelet - Like New Flawless - Purchased From Watchbuys Feb 2026 - Full Kit

Sinn U50 T SDR Fully Tegimented ON Tegimented H-Link Quick Adjust Submarine Steel Bracelet - Like New Flawless - Purchased From Watchbuys Feb 2026 - Full Kit

Sinn - U50 T SDR · $4,500
A Sinn U50 T SDR with a fully tegimented H-Link quick adjust submarine steel bracelet. This configuration is highly rare and the watch can go up to 500m underwater.

  • Condition: Like New Flawless
  • Thickness: 11mm
  • Water depth rating: 500m
  • Bracelet material: Fully Tegimented H Link Quick Adjust Steel Bracelet
Posted at
Mar 1, 2026, 5:26 PM
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[WTS] Sinn 556i RS Full set

Sinn 556i RS Full set

Sinn - 556i RS · $1,400
A German-made watch with a sleek black dial and red seconds hand, perfect for outdoor adventures and daily wear.

  • Case Diameter: 38.5mm
  • Thickness: 11mm
  • Lug Width: 20mm
Posted at
Mar 1, 2026, 8:47 AM
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[WTS] Collection Consolidation Sale! Tudor, Seiko, Breitling, Sinn

Collection Consolidation Sale! Tudor, Seiko, Breitling, Sinn

Sinn - 3006 · $4,350
A Tudor Bucherer Blue watch in excellent condition, purchased new in Switzerland in 2023. It is one of the watches being sold as part of a collection consolidation sale.

  • Condition: Lightly worn, functions perfectly
  • Bracelet: includes metal bracelet kit
  • Movement: Grand Seiko movement
Posted at
Feb 28, 2026, 1:14 PM
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[WTS] Sinn 556A - Full++ kit with quick adjust clasp, original clasp, Russian cowhide leather strap, SteelReef quick adjust link, and many extra links.

Sinn 556A - Full++ kit with quick adjust clasp, original clasp, Russian cowhide leather strap, SteelReef quick adjust link, and many extra links.

Sinn - 556A · $1,900
This Sinn 556A comes with a new quick-adjust clasp and a bunch of extras, including the original normal adjust clasp, SteelReef's quick-adjust link, Russian cowhide leather strap, and an extra bracelet.

  • Clasp Type: quick-adjust clasp
  • Bracelet Condition: new with barely any wear
  • Strap Material: Russian cowhide leather
Posted at
Feb 27, 2026, 8:29 PM
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[WTS] Sinn 556i Black PVD Coating

Sinn 556i Black PVD Coating

Sinn - 556i · $1,200
The Sinn 556i with a black PVD coating is a unique take on a modern classic, transforming the tool watch into a stealthy, tactical daily driver while retaining German engineering.

  • Condition: very good
  • Case Size: 38.5mm diameter
  • Thickness: 11mm
  • Movement: Sellita SW200-1 automatic (28,800 vph, 38-hour power reserve)
Posted at
Feb 27, 2026, 4:06 PM
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[WTS] Sinn 144 I ST SA Full Set 2019 ref. 144.13885

Sinn 144 I ST SA Full Set 2019 ref. 144.13885

Sinn - 144.13885 · $2,800
The Sinn 144 I ST SA is a performance German tool watch with a focus on extreme functionality, durability, and technological innovation, known for its instrument-style design and readability.

  • Condition: Light wear but no damage
  • Case size: 41mm diameter
  • Bracelet size: 20mm hooded lug width
  • Movement: Concepto C99001 automatic chronograph
Posted at
Feb 27, 2026, 9:36 AM
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[WTS] Brand new U50-T SDR with custom destro crown position, fully tegimented bracelet, new adjustable clasp, full set, purchased direct from Sinn 3 weeks ago.

Brand new U50-T SDR with custom destro crown position, fully tegimented bracelet, new adjustable clasp, full set, purchased direct from Sinn 3 weeks ago.

Sinn - U50-T SDR
This is a brand new Sinn U50-T SDR with custom modifications, purchased directly from Sinn three weeks ago. The seller has 100% feedback on eBay and is open to video calls for verification.

  • Condition: New
  • Crown position: custom destro
  • Bracelet status: fully tegimented
  • Clasp type: adjustable
Posted at
Feb 27, 2026, 8:38 AM
Active
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[WTS] Sinn 556. Box, Papers. $1150 only..

Sinn 556. Box, Papers. $1150 only..

Sinn - 556 · $1,150
A Sinn 556 watch for sale, including box and papers.

  • Box: yes
  • Papers: yes
  • Links: yes
Posted at
Feb 23, 2026, 3:47 PM
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[WTS] Sinn 836 with goodies

Sinn 836 with goodies

Sinn - 836 · $1,800
The Sinn 836 is a rare and beautiful watch that comes with a full kit and additional items, including branded leather and silicone straps, tools, extra links, card, booklet, and two boxes.

  • Condition: excellent
  • Strap: branded OG leather strap
  • Silicone: branded OG silicone
Posted at
Feb 23, 2026, 12:26 PM
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