Encyclopedia / Seiko / Prospex SPB143
No real new deal right now · checked Oct 20, 2026, 1:07 AM ET
$950 – $1,400 pre-owned street range
Ref. SPB143 · 20 listings sampled (median ~$1,000)
No new deal: I found no in-stock new listing at Jomashop or WatchMaxx. Range = middle 80% of Chrono24 asking prices on the first results page. Fixed-price listings only.
Price comparison: fixed-price listings
| Store | Condition | Box & papers | Asking price | Link | Checked |
|---|---|---|---|---|---|
| Chrono24 (Private Seller) | unworn | Yes | $1,028 | View | Oct 20, 2026 |
Fixed-price (buy-now) asking prices in USD for ref. SPB143, cheapest new and cheapest pre-owned with box and papers per store, sorted low to high and checked Oct 20, 2026 (ET). Buy-now listings only. Pre-owned listings are shown only when the listing states box and papers. * New from a grey-market dealer: comes boxed, but the warranty card may be the dealer's rather than the brand's. Chrono24 rows are individual third-party marketplace sellers. Prices change fast; confirm with the store.
What it really costs
| Market | Price | Source |
|---|---|---|
| Seiko US online store (ShopSeiko) | $1,200 | shopseiko.com |
| Pre-owned (Chrono24 asks) | about $950 – $1,400 (median ~$1,000, 20 listings sampled) | Chrono24 |
All prices in USD, checked Oct 20, 2026 (ET). Pre-owned ranges are the middle 80% of asking prices on the first Chrono24 results page for that ref (used and some unworn; sample size shown per row), fixed-price listings only. Grey-market = brand-new from a non-authorized dealer.
Buying guide
Key references
| Ref. | What it is | US retail |
|---|---|---|
| SPB143 | Prospex 1965 Heritage Diver's Watch, steel bracelet | $1,200 |
Which one I'd pick
Which one: SPB143 is the grey-dial steel-bracelet version (SPB143J1). ShopSeiko lists it at $1,200; Chrono24 asks centred near $1,000.
What to check before you buy
- Exact reference: dial colour, size and strap change the price. Match the full ref (SPB143) before comparing deals.
- Fakes and red flags: be wary of prices far below the ranges above, stock photos only, or sellers who won't show the caseback, serial and papers.
Alternatives worth a look
- Seiko Prospex Alpinist: Seiko's field-watch sibling. (39.5 mm stainless steel, Calibre 6R35, retail $900 (current SPB507, Seiko US))
- Seiko Prospex 'Turtle': Cheaper Seiko diver. (45 mm stainless steel, Calibre 4R36, retail $525 (SRPE93))
- Tudor Black Bay 58: Step-up vintage-style diver. (39 mm stainless steel, Calibre MT5400-U, retail From $4,975 (rubber); $5,225–$5,350 on bracelet)
History
Seiko was founded in Tokyo in 1881 by Kintarō Hattori; it launched Japan's first diver's wristwatch in 1965 and introduced the world's first commercial quartz wristwatch in 1969.
The SPB143 is Seiko's '1965 Heritage Diver's Watch', with the 6R35 automatic and 200 m diver's water resistance, per Seiko.
Specifications
| Brand | Seiko |
|---|---|
| Model | Prospex SPB143 |
| Key references | SPB143 |
| Launch year | Not confirmed |
| Case | 40.5 mm Stainless Steel |
| Thickness | 13.2 mm |
| Lug-to-lug | 47.6 mm |
| Lug width | 20 mm |
| Crystal | Curved sapphire, inner AR coating |
| Bezel | Unidirectional rotating |
| Functions | Date, hacking seconds |
| Movement | Seiko Caliber 6R35, automatic |
| Power reserve | About 70 hours |
| Water resistance | 200 m |
| Approx. US retail (Oct 2026) | $1,200 (per ShopSeiko) |
Specs from the retailer (Jomashop/WatchMaxx) or brand product page linked above for the main reference; see our research notes for which. Retail prices are list prices, not market value, and change often.
Highlights
- 40.5 mm steel case, 13.2 mm thick
- Caliber 6R35 automatic, about 70 hours
- 200 m diver's rating
FAQ
How much is the Seiko Prospex SPB143?
Seiko US online store (ShopSeiko) is $1,200. Pre-owned asking prices on Chrono24 mostly ran $950 – $1,400 (median ~$1,000), checked Oct 20, 2026, 1:07 AM ET.
What movement does the Prospex SPB143 use?
The SPB143 checked here uses: Seiko Caliber 6R35, automatic, about 70 hours of power reserve.
How big is the Prospex SPB143?
40.5 mm Stainless Steel.
Is the Prospex SPB143 water resistant?
It's rated to 200 m.
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Get the free weekly issuePrices and availability last checked Oct 19, 2026. No affiliate links: I don't earn anything if you buy. Sources are listed in our research notes and linked above.