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

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The price of this watch is an outlier for this particular model and not included in the distribution. It may be miscategorized, incorrectly priced, or extremely unique.

Highest:	$530	Lowest:	$80
Median:	$220.00	Std. Dev:	±$74.06

Estimated Private Party Value $168 — $245


	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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