Thumbnail [WTS] Sinn 556A RS + New OTF Adjustment Clasp 1

Model:	Sinn 556a	Last Scraped:	Sept. 26, 2025, 10:17 p.m.
Username:	Klutzy-Check8977	Location:	Unknown
Email:	Unknown	Feedback:	No Reviews Found

Bought a months ago from a friend. worn a in a rotation of 8 watches. Warranty card dated 03/2024. Selling to fund another piece I also bought the new OTF adjustment clasp for it which is truly awesome. The old clasp was stamped, only had 3 adjustment holes so I couldn’t dial in the right fit, and was a little too long. This one addresses all those issues! Condition: near mint except for a very small scratch at the 7pm on the side of the bezel and the lug. Barely noticeable depending on lighting. Asking for $1300 via any payment options. If you’re going to use PayPal then please use G+S and add 4% on you (unless you have plenty of references) Shipping USA only with shipping on me! If you’re in Twin cities Minnesota, let’s meet up and I can waive $50 from the cost! Thank you! No trades, Please Timestamp: https://imgur.com/a/75WF4pM Condition & Kit: https://imgur.com/a/iz6gkLt

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Highest:	$1,599	Lowest:	$975
Median:	$1,224.50	Std. Dev:	±$167.62

Estimated Private Party Value $1,050 — $1,300


	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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