Thumbnail [WTS] Vintage Grand Seiko Hi-Beat 5646-7020 Automatic Watch 56GS - Green Dial 1972 1

Thumbnail [WTS] Vintage Grand Seiko Hi-Beat 5646-7020 Automatic Watch 56GS - Green Dial 1972 2

Thumbnail [WTS] Vintage Grand Seiko Hi-Beat 5646-7020 Automatic Watch 56GS - Green Dial 1972 3

Thumbnail [WTS] Vintage Grand Seiko Hi-Beat 5646-7020 Automatic Watch 56GS - Green Dial 1972 4

Thumbnail [WTS] Vintage Grand Seiko Hi-Beat 5646-7020 Automatic Watch 56GS - Green Dial 1972 5

Thumbnail [WTS] Vintage Grand Seiko Hi-Beat 5646-7020 Automatic Watch 56GS - Green Dial 1972 6

Thumbnail [WTS] Vintage Grand Seiko Hi-Beat 5646-7020 Automatic Watch 56GS - Green Dial 1972 7

Thumbnail [WTS] Vintage Grand Seiko Hi-Beat 5646-7020 Automatic Watch 56GS - Green Dial 1972 8

Thumbnail [WTS] Vintage Grand Seiko Hi-Beat 5646-7020 Automatic Watch 56GS - Green Dial 1972 9

Thumbnail [WTS] Vintage Grand Seiko Hi-Beat 5646-7020 Automatic Watch 56GS - Green Dial 1972 10

Model:	Seiko 5646-7010	Last Scraped:	July 12, 2025, 11:16 p.m.
Username:	Fearless_Mood_3821	Location:	Unknown
Email:	Unknown	Feedback:	No Reviews Found

Model: Grand Seiko 5646-7020 - 995$ shipped US or international. Located in Houston. • Serial Number: 2N7779 (1972 production) • Movement: Seiko 5646A – Hi-Beat 28,800bph, automatic, with hand-winding and quickset day/date • Case Size: Approx. 36mm diameter (without crown) • Dial: Rare factory original green gradient dial with vertical brushing and applied Seiko & GS logos • Crystal: Original faceted Hardlex crystal, mint like new condition. • Case: Original stainless steel case, unpolished and all original case lines. • Crown: GS-signed original • Bracelet: Vintage stainless steel jubilee-style bracelet, unsigned but period-correct and very comfortable • Caseback: Gold medallion intact, clear engravings, no tool slips or corrosion • Functions: Day/date (English + Kanji), hacking seconds, hand-winding, quickset via crown push Timekeeping Performance: • Keeps excellent time within approx. +-10 seconds/day • Day/date switches correctly • Hacking and hand-winding both operational

Reputation and Feedback

This seller did not provide contact information in the listing description. You must be a member of Reddit to send them a private message. If you are not already a member, request a new account at https://www.reddit.com/register/.

No feedback was found for this seller. Although this does not mean the seller is untrustworthy, you should exercise caution in dealing with them.

Also keep in mind: TimeZone, Chronotrader, Seiko & Citizen Watch Forum, and Wrist Sushi do not have dedicated feedback forums.

Highest:	$1,050	Lowest:	$80
Median:	$245.00	Std. Dev:	±$287.92

Estimated Private Party Value $180 — $530


	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.

View Brand Page

Affiliate links: WatchPatrol may receive a commission if you purchase a product from eBay.

	SEIKO Grand Seiko High Beat 5646-7010 Day Date Vintage Automatic Winding nizaemon.store (119) eBay (JP) • Buy It Now	$850.00
	Vintage Grand SEIKO Men's Automatic Watch Medallion HI-BEAT DAY DATE 5646-7010 tomcat322 (2804) eBay (JP) • Buy It Now	$589.00
	SEIKO Grand Seiko 5646 7010 Hi Beat Day Date Automatic Watch Vintage Junk kky_japan_premium_shop (556) eBay (JP) • Buy It Now	$604.00
	[Near MINT] Vintage 1970 SEIKO Grand Seiko Hi-Beat 5646-7010 Auto White 36mm Men ishiro1325 (165) eBay (JP) • Buy It Now	$899.90
	Vintage Rare Grand SEIKO 5646-7010 SS Automatic White Dial Men's Watch USED monomono-japan (1188) eBay (JP) • Buy It Now	$874.67