Thumbnail [WTS] Sinn 356 Satin Finish, Sapphire Sandwich full kit only a couple weeks old. On the fly bracelet. 1

Thumbnail [WTS] Sinn 356 Satin Finish, Sapphire Sandwich full kit only a couple weeks old. On the fly bracelet. 2

Thumbnail [WTS] Sinn 356 Satin Finish, Sapphire Sandwich full kit only a couple weeks old. On the fly bracelet. 3

Thumbnail [WTS] Sinn 356 Satin Finish, Sapphire Sandwich full kit only a couple weeks old. On the fly bracelet. 4

Thumbnail [WTS] Sinn 356 Satin Finish, Sapphire Sandwich full kit only a couple weeks old. On the fly bracelet. 5

Thumbnail [WTS] Sinn 356 Satin Finish, Sapphire Sandwich full kit only a couple weeks old. On the fly bracelet. 6

Model:	Sinn 356	Last Scraped:	Sept. 18, 2025, 11:47 p.m.
Username:	Spiritual_Status_285	Location:	Unknown
Email:	Unknown	Feedback:	No Reviews Found

Hey everyone, I am selling my Sinn 356 I just purchased from Watchbuys a few weeks ago to fund another watch purchase. This is the top of the line model with satin finish and sapphire on the front and back. The only signs of wear are a couple strap changing marks on the back of the lugs. Please reach out with question or if you would like to FaceTime. I will be selling CONUS only and accept Zelle, Venmo or PP f&f. Cheers! $3500 shipped insured.

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Highest:	$3,500	Lowest:	$1,199
Median:	$2,175.00	Std. Dev:	±$567.35

Estimated Private Party Value $1,663 — $2,550


	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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