Thumbnail [WTS] Seiko Tuna SBBN045 (price drop - $850) 1

Thumbnail [WTS] Seiko Tuna SBBN045 (price drop - $850) 2

Thumbnail [WTS] Seiko Tuna SBBN045 (price drop - $850) 3

Thumbnail [WTS] Seiko Tuna SBBN045 (price drop - $850) 4

Thumbnail [WTS] Seiko Tuna SBBN045 (price drop - $850) 5

Thumbnail [WTS] Seiko Tuna SBBN045 (price drop - $850) 6

Thumbnail [WTS] Seiko Tuna SBBN045 (price drop - $850) 7

Thumbnail [WTS] Seiko Tuna SBBN045 (price drop - $850) 8

Thumbnail [WTS] Seiko Tuna SBBN045 (price drop - $850) 9

Thumbnail [WTS] Seiko Tuna SBBN045 (price drop - $850) 10

Thumbnail [WTS] Seiko Tuna SBBN045 (price drop - $850) 11

Thumbnail [WTS] Seiko Tuna SBBN045 (price drop - $850) 12

Thumbnail [WTS] Seiko Tuna SBBN045 (price drop - $850) 13

Thumbnail [WTS] Seiko Tuna SBBN045 (price drop - $850) 14

Thumbnail [WTS] Seiko Tuna SBBN045 (price drop - $850) 15

Thumbnail [WTS] Seiko Tuna SBBN045 (price drop - $850) 16

Thumbnail [WTS] Seiko Tuna SBBN045 (price drop - $850) 17

Thumbnail [WTS] Seiko Tuna SBBN045 (price drop - $850) 18

Thumbnail [WTS] Seiko Tuna SBBN045 (price drop - $850) 19

Model:	Seiko Tuna	Last Scraped:	Jan. 3, 2026, 2:17 p.m.
Username:	glock75	Location:	Unknown
Email:	Unknown	Feedback:	No Reviews Found

Hey everyone! I'm selling this now discontinued Seiko Prospex SBBN045 Tuna. Fully boxed with hang tag, stamped warranty card, and February 2024 service papers (they have some personal info on them so I can provide pictures to perspective buyers and will provide paper copies to the buyer). Reference # is S23629J1 (or in JDM as SBBN045). This reference features Seiko's 7c46 quartz movement which is exclusive to the Tunas, a diashield coated case, a sapphire crystal, and black day / date display. This example is in very good used condition (noticeable scratches/ marks on the bezel insert in the right light which I tried to capture). Case measures 47.7 wide and 14.3 thick, with a 48mm lug to lug measurement and 22mm lug width. Purchased here last year for $1,000, only wore once, and now looking for **~~$950~~ $850 shipped** in the US, payment via PP F&F or Venmo. Timestamp: https://imgur.com/a/Le3yYpF Photo album: https://imgur.com/a/WIja9CR

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Highest:	$1,795	Lowest:	$110
Median:	$375.00	Std. Dev:	±$459.55

Estimated Private Party Value $250 — $850


	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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