Thumbnail [WTS] Seiko 5y23-7040 SQ Day Date super rare Quartz Japanese Watch 1

Thumbnail [WTS] Seiko 5y23-7040 SQ Day Date super rare Quartz Japanese Watch 2

Thumbnail [WTS] Seiko 5y23-7040 SQ Day Date super rare Quartz Japanese Watch 3

Thumbnail [WTS] Seiko 5y23-7040 SQ Day Date super rare Quartz Japanese Watch 4

Thumbnail [WTS] Seiko 5y23-7040 SQ Day Date super rare Quartz Japanese Watch 5

Thumbnail [WTS] Seiko 5y23-7040 SQ Day Date super rare Quartz Japanese Watch 6

Thumbnail [WTS] Seiko 5y23-7040 SQ Day Date super rare Quartz Japanese Watch 7

Thumbnail [WTS] Seiko 5y23-7040 SQ Day Date super rare Quartz Japanese Watch 8

Thumbnail [WTS] Seiko 5y23-7040 SQ Day Date super rare Quartz Japanese Watch 9

Model:	Seiko 7A28-7040	Last Scraped:	May 7, 2025, 4:17 p.m.
Username:	No_Purchase5197	Location:	Unknown
Email:	Unknown	Feedback:	No Reviews Found

Hi all. Selling this holy grail of vintage Seikos here • ⁠Reference Number: 5Y23-7040 • ⁠Production Month/Year: around 1982 • ⁠Diameter: 36mm • ⁠Movement: Seiko 5Y23 day-date movement - Working perfectly with brand new batteries • ⁠Crown: Factory Seiko crown • ⁠Water Resistance: in theory factory says 30m water resistant (not tested) • ⁠Crystal: Hardlex Crystal • ⁠Strap/Bracelet: metal bracelet, adjustable, in good condition • ⁠Wrist size is 6.75 inches to have a better understanding of sizing fit • ⁠Accessories: There are no supporting documents/papers or the box, the watch will be delivered in a box and safely secured with plenty of bubble wrap • ⁠Watch is in Mexico City. I'm a brazilian expat working and living here. • ⁠Shipping method to be discussed and covered by the buyer (DHL, FedEX, EMS etc) • ⁠Payment Through PayPal I have several Seiko's vintage watches for Sale, all of them in excelent condition. Drop a DM if needed...

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Highest:	$650	Lowest:	$135
Median:	$350.00	Std. Dev:	±$150.96

Estimated Private Party Value $185 — $475


	Established:	1881
	Website:	http://seikousa.com/index.php
	Country of Origin:	Japan

The company was founded in 1881, when Kintarō Hattori opened a watch and jewelry shop called "K. Hattori" (服部時計店 Hattori Tokeiten?) in the Ginza area of Tokyo, Japan. Eleven years later, in 1892, he began to produce clocks under the name Seikosha (精工舎 Seikōsha?), meaning roughly "House of Exquisite Workmanship". According to Seiko's official company history, titled "A Journey In Time: The Remarkable Story of Seiko" (2003), Seiko is a Japanese word meaning "exquisite" or "success" ("exquisite" is usually written 精巧 from Chinese jīngqiǎo, while the meaning "success" is usually written 成功 from Chinese chénggōng).

Seiko is perhaps best known for its wristwatches, all of which were at one time produced entirely in-house. This includes not only major items such as microgears, motors, hands, crystal oscillators, batteries, sensors, LCDs but also minor items such as the oils used in lubricating the watches and the luminous compounds used on the hands and the dials.

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