Thumbnail [WTS] Sinn 356 Flieger Sa Display Back on Strap - Sapphire Crystal - Mint Condition - 39mm Automatic Chronograph - Full Kit - retails $3440 on WatchBuys and Sold Out - Only $2600 shipped CONUS 1

[WTS] Sinn 356 Flieger Sa Display Back on Strap - Sapphire Crystal - Mint Condition - 39mm Automatic Chronograph - Full Kit - retails $3440 on WatchBuys and Sold Out - Only $2600 shipped CONUS

Posted by No-Kick-2577 in reddit.com Jan. 15, 2026, 12:53 a.m.

$2,600

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Model:	Sinn 356	Last Scraped:	Jan. 15, 2026, 1:16 a.m.
Username:	No-Kick-2577	Location:	Unknown
Email:	Unknown	Feedback:	No Reviews Found

Hello, Up for sale is my mint condition Sinn 356 Flieger Sa Display Back on Strap. This is the sapphire variant on a gorgeous Sinn leather strap with contrast stitching. $2600 shipped CONUS via F&F or Zelle. No trades. Timestamp in last photo. Watch diameter (mm): 38.5 • Watch height (mm): 15.0 • Lug width (mm): 20 • Lug to lug (mm): 46 • Weight - head only (grams): 75 • Water resistance: 100 meters • Case finish: Satinized • Case metal: Stainless steel • Case back: Transparent • Dial color: Black • Front crystal: Sapphire • Movement: Automatic mechanical • Calibre: SW500 • Strap or bracelet: Strap • Manufacturer's limited warranty: 2 years

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Highest:	$3,500	Lowest:	$1,199
Median:	$2,300.00	Std. Dev:	±$557.71

Estimated Private Party Value $1,925 — $2,700


	Established:	1961
	Website:	http://www.sinn.de/de/
	Country of Origin:	Germany

Sinn Spezialuhren GmbH is a manufacturer of mechanical wristwatches based in Frankfurt am Main. The company was founded in 1961 by flight instructor and pilot Helmut Sinn under the name ‘Helmut Sinn Spezialuhren’.

Following its foundation in 1961, the company focused on the manufacture of navigation cockpit clocks and pilot chronographs and sold these through direct selling, bypassing retailers. The clocks and watches were produced according to pilot Helmut Sinn’s specifications in the private label sector in Switzerland. By eliminating the trade margin of the retailers, the company was able to offer its clocks and watches at a lower price than through traditional sales channels.

In 1994, Helmut Sinn sold the company to Lothar Schmidt. Following the sale, he acquired Swiss watchmaker Guinand in 1996. In 1998, he set up a new company in Frankfurt am Main. With this company, he offered brand watches from Jubilar, Chronosport and the newly acquired Guinand. In 2006, he retired from business activity. Since handing over the management of the business to his long-standing employee Horst Hassler, he now acts as an advisor to the company. On September 3rd 2016 Helmut Sinn celebrated his 100th birthday.

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