Model:	Sinn 556a	Last Scraped:	Sept. 26, 2025, 6:16 p.m.
Username:	angeeezzy	Location:	Unknown
Email:	Unknown	Feedback:	No Reviews Found

Up for sale is my Sinn 556a RS which I purchased here on r/watchexchange a couple years ago. It is in excellent condition, case and crystal are clean. It’s currently on a hybrid nylon/silicone strap but comes with the original Sinn leather strap as pictured. No H-link bracelet for this particular piece. $1,050 shipped in the CONUS Payment via Zelle preferred Album https://imgur.com/a/7Tt4SNy Timestamp https://imgur.com/a/kNASDJc

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Highest:	$1,599	Lowest:	$975
Median:	$1,100.00	Std. Dev:	±$157.97

Estimated Private Party Value $1,050 — $1,275


	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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