Thumbnail [WTS] Sinn 556i Mother of Pearl (MOP) Black on H-Link 1

Model:	Sinn 556i	Last Scraped:	June 25, 2025, 12:17 p.m.
Username:	holein3	Location:	Unknown
Email:	Unknown	Feedback:	No Reviews Found

Selling my Sinn 556i Black Mother of Pearl watch. Recently purchased on here a few weeks ago, but decided to jump on a 556i RS that I bought on eBay as it better suits my intended (less dressy) everyday use. I’d love to keep both to use the MOP for dressier occasions, but need to sell to fund the RS. [Photos/video](https://imgur.com/a/noaxlm9) [Timestamp](https://imgur.com/25NbWKz) It is in great condition – no blemishes on the crystal or case. The h-link bracelet has desk diving marks as shown in the photos. It’s sized for my 7-inch wrist and comes with 3 extra links, the allen wrench tools, and the Sinn bracelet tool. Includes original warranty card and manual. The watch keeps time +6-8s/day and was improving over the time I was wearing it daily (timing log shown in the last photo). Asking **$1575 shipped CONUS** fully insured. Payment via PayPal (G&S +3.6%) or Zelle. Located in MA, US. Can show the watch over Google Meet and provide any additional photos/videos you need. Thanks!

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Highest:	$1,575	Lowest:	$690
Median:	$1,194.50	Std. Dev:	±$174.20

Estimated Private Party Value $1,044 — $1,264


	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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