Model:	Sinn 556	Last Scraped:	Oct. 9, 2025, 12:17 p.m.
Username:	Gorman63	Location:	Unknown
Email:	Unknown	Feedback:	No Reviews Found

Offering for sale a Sinn 556 I RS 2023. Full set including card (dated 2023), box, all papers. No receipt. Bought in Europe by myself. Striking form, sparse dial design, superior readability – characteristic SINN features which highlight the similarities between the 556 series and our pilot and navigation cockpit clocks. The accentuation of the hours, minutes, seconds and the date plus the satinized stainless steel case are what give the watches their sporty yet elegant appearance. The crystal of the 556 watches is made from sapphire crystal, as is the transparent back which provides an intriguing insight into the filigree mechanical movement inside. The model 556 I RS has a special feature: The red second hand is in a harmonious contrast to the black of the dial and the white of the indices. Asking $1300 shipped CONUS, payment Zelle/Wire. US only, please. Thanks for looking! Trades Accepted!

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Highest:	$2,000	Lowest:	$590
Median:	$1,250.00	Std. Dev:	±$290.49

Estimated Private Party Value $1,050 — $1,450


	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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