Thumbnail [WTS] 1955 Omega Seamaster Ref. 6278-9 – Cal. 500 Automatic – $875 1

Thumbnail [WTS] 1955 Omega Seamaster Ref. 6278-9 – Cal. 500 Automatic – $875 2

Thumbnail [WTS] 1955 Omega Seamaster Ref. 6278-9 – Cal. 500 Automatic – $875 3

Thumbnail [WTS] 1955 Omega Seamaster Ref. 6278-9 – Cal. 500 Automatic – $875 4

Model:	Omega Seamaster	Last Scraped:	Aug. 17, 2025, 1:16 a.m.
Username:	dynavictus	Location:	Unknown
Email:	Unknown	Feedback:	No Reviews Found

Up for sale is a vintage Omega Seamaster ref. 6278-9, circa 1955–56. This is a U.S.-market Ross-cased example with a 10K gold-filled bezel and stainless back, powered by Omega’s Caliber 500 — their first generation full-rotor automatic movement. • Reference: 6278-9 (Ross R552 stamped caseback) • Movement: Omega Cal. 500 automatic, 17 jewels, serial ~14.8M (1955–56 production) • Case: 34mm (excl. crown), 10K gold-filled bezel, stainless steel back • Crystal: Acrylic, small hairline crack present (visible in photos) • Strap: Aftermarket leather strap • Condition: Honest vintage wear throughout, consistent with age. Dial appears original. • Extras: Watch only, no box or papers. Price: $875 shipped CONUS Payment: PayPal F&F, Zelle Location: LA, CA Shipping: CONUS included, international at buyer’s cost

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Highest:	$9,000	Lowest:	$1
Median:	$2,250.00	Std. Dev:	±$2,098.02

Estimated Private Party Value $990 — $4,196


	Established:	1848
	Website:	https://www.omegawatches.com/
	Country of Origin:	Switzerland

Founded at La Chaux-de-Fonds, Switzerland in 1848 by 23-year-old Louis Brandt who assembled key-wound precision pocket watches from parts supplied by local craftsmen. He travelled throughout Europe selling his watches from Italy to Scandinavia by way of England, his chief market. After Louis Brandt's death in 1879, his two sons Louis-Paul and Cesar, troubled by irregular deliveries of questionable quality, abandoned the unsatisfactory assembly workshop system in favour of in-house manufacturing and total production control. Due to the greater supply of manpower, communications and energy in Bienne, the enterprise moved into a small factory in January 1880, then bought the entire building in December. Two years later the company moved into a converted spinning-factory in the Gurzelen district of Bienne, where headquarters are still situated today. Their first series-produced calibres, Labrador and Gurzelen, as well as, the famous Omega calibre of 1894, would ensure the brand's marketing success.

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