Thumbnail [WTS] Sinn 356 Flieger 2025 Full Kit with new Quick Adjust Clasp 1

Model:	Sinn 356	Last Scraped:	Dec. 27, 2025, 5:17 p.m.
Username:	1234tuba	Location:	Unknown
Email:	Unknown	Feedback:	No Reviews Found

Posting my beautiful Sinn 356 Flieger for sale. Full kit including the new quick adjust bracelet clasp. Watch is is mint condition save for some surface level marks on the clasp and bracelet. Zero marks on back of lugs. I don't see a single mark on the watch head itself. This is the acrylic crystal version with solid caseback. Warranty card dated June 2025. Watch runs great, chrono functions reset perfectly. Watch is running fast at +13/day wearing all day and resting face up at night. I took this to a local watchmaker and he put it on timegrapher - sounds like amplitude is high. I reached out to Sinn but haven’t heard back yet, and as I am eyeing something new, I’d rather move on at a lower price. As this is from 2025, shouldn’t be any issue getting warranty adjusted. The 356 is one of my favorites, just enjoying the hobby and trying new watches, and one in one out policy... Asking $2000 plus shipping (currently sold out on Watchbuys with retail of $3140). [Timestamp and Pics](https://imgur.com/a/z1sqVex)

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Highest:	$3,500	Lowest:	$1,199
Median:	$2,250.00	Std. Dev:	±$565.55

Estimated Private Party Value $1,800 — $2,674


	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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