Model:	Sinn 556	Last Scraped:	Nov. 23, 2025, 2:17 a.m.
Username:	Lower_Ad_1146	Location:	Unknown
Email:	Unknown	Feedback:	No Reviews Found

This Sinn 556 I (indices dial) was originally purchased in Japan in 2022 and includes the Japanese-market manual, papers, and warranty card. It features the Top Grade ETA 2824-2 movement—confirmed by community members—as Sinn was transitioning away from ETA at the time. I bought this watch here on r/WatchExchange for $1,310 about four months ago and have worn it occasionally since. The case and crystal are clean with no visible AR coating marks, the bracelet shows only light hairlines, and the clasp has normal desk-diving scuffs. The watch runs well and winds smoothly. Specs are 38.5mm × 11mm with a 20mm lug width and 200m water resistance (screw-down crown). Included are the inner/outer boxes, papers, warranty card, and four spare links (no Sinn sizing tool). Asking $1,250 + shipping, just looking to pass it along at a fair price. Ships from New York. Payment via Zelle, Venmo, or PayPal F&F. No trades.

First Posted:	3 weeks ago	# of Reposts:	2
Starting Price:	$1,250	Price Change:	same price

Hide Reposts (1)

First Posted	3 weeks ago	[WTS] Sinn 556 I		$1,250
Repost	2 weeks ago	[WTS] Sinn 556		$1,250

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Highest:	$2,000	Lowest:	$590
Median:	$1,250.00	Std. Dev:	±$285.63

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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