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The Spinnaker Spence 300 Automatic is a 40 mm steel dive-watch family, but its published dimensions and strap details depend on the exact reference and regional listing. Spinnaker Japan lists the SP-5097-11-N at 10.9 mm thick, while Spinnaker US lists the navy SP-5097-BB at 11.5 mm thick and 48 mm lug-to-lug. Both pages describe a 300 m / 30 ATM water-resistance rating; check the specific reference and current regional listing before buying.
What are the Spinnaker Spence 300 specs?
The Spence 300 is an automatic steel dive-watch family identified in WatchPro’s 2022 dive-watch buyers’ guide. The official product pages give details for individual SP-5097 references; they should not be treated as one universal specification sheet.
| Listing and reference | Case and dimensions | Movement and water resistance | Crystal and strap | Price and warranty listed |
|---|---|---|---|---|
| Spinnaker Japan, SP-5097-11-N | 40 mm case; 10.9 mm thick (official Japanese listing retrieved 2026) | Automatic cal. 9039; 300 m water resistance | Sapphire crystal; strap details not stated on the cited source | ¥74,800 including tax; warranty details not stated on the cited source |
| Spinnaker US, navy SP-5097-BB | 40 mm case; 11.5 mm thick; 48 mm lug-to-lug (official US listing retrieved 2026) | Automatic movement; 30 ATM water resistance; caliber not stated on the cited source | Sapphire lens; 20 mm stainless-steel bracelet and extra grey rubber strap | $650 USD listed; two-year international warranty (official US listing retrieved 2026) |
The Japanese and US listings provide different thickness figures for different references. The sources do not establish whether the discrepancy comes from a variant, measurement method, or listing update, so use the dimensions on the page for the exact watch being considered.
Is the Spinnaker Spence 300 a 300 m dive watch?
Spinnaker Japan rates the SP-5097-11-N to 300 m, and the US navy SP-5097-BB listing states 30 ATM, equivalent to a 300 m rating as presented by the manufacturer. These are manufacturer-listed ratings; they do not establish independent testing of an individual watch or certification to a named professional dive-watch standard. Treat the rating as a specification, not as a substitute for checking the watch’s condition, seals, and service history before underwater use.
#1 Best Overall
- SPINNAKER - OUR STORY: It is the sea and crafts that glide and dive into her waters that inspire so much of our design. The spirit of aquatic influence lies at the heart of each Spinnaker collection. Our timepieces, through a combination of material, design and craftsmanship, pay tribute to both a technical command and for a life beneath, beyond and beside the sea.
- THE SPENCE 300AUTOMATIC: The Spence 300 is a remarkable timepiece. Not in heft, not in size but in the sheer precision of its engineering. Carefully considered design and hand assembled workmanship results in a timepiece that is only 11.5mm in thickness yet capable of enduring over 300m of water resistance.
- MOVEMENT: The Spence 300 Automatic is powered by a powerful yet slim hacking 9039 Miyota Self-winding automatic movement featuring 24 Jewels, 28,800 bph and power reserve of 42 hours
- THE FINER DETAILS: Featuring a 40mm stainless steel case, 20mm solid stainless steel bracelet, an extra 22mm genuine leather strap, anti reflection coated sapphire lens and water resistance of up to 30 ATM.
- WARRANTY: 2 years International Warranty
How thick is the Spence 300?
The official Japanese page for reference SP-5097-11-N gives 10.9 mm thickness. The official US page for navy reference SP-5097-BB gives 11.5 mm thickness and a 48 mm lug-to-lug measurement. Those are the exact page-specific figures available; don’t assume one applies to every dial or reference in the family.
What should you verify before buying?
- Reference and color: Match the SP-5097 code and dial/color shown on the seller’s listing to the watch you intend to buy.
- Dimensions: Confirm the listed thickness and lug-to-lug for that specific reference if fit under a cuff or wrist coverage matters.
- Bracelet and extra strap: The US navy page specifies a 20 mm bracelet and extra grey rubber strap. That does not confirm that every aftermarket 20 mm strap, clasp, or end link will fit; verify the attachment and end-link compatibility.
- Price, currency, and warranty: The official US and Japan pages show regional prices and terms, not guaranteed checkout totals. Check the live listing for current price, taxes, shipping, availability, and applicable warranty.
- Condition for water use: A stated rating does not confirm the present water resistance of a used or long-stored watch. Ask about inspection or pressure testing where relevant.
How does the 2022 price context compare with current listings?
WatchPro’s 2022 buyers’ guide listed the Spence 300 at £500. That is historical context, not a current UK price. Spinnaker’s official pages retrieved in 2026 list ¥74,800 including tax for Japan reference SP-5097-11-N and $650 USD for the US navy SP-5097-BB. These are different regional listings for different references, so they are not a direct like-for-like price comparison or a promise of today’s checkout cost.
Quick Recap
Rank #4
- SPINNAKER - OUR STORY: It is the sea and crafts that glide and dive into her waters that inspire so much of our design. The spirit of aquatic influence lies at the heart of each Spinnaker collection. Our timepieces, through a combination of material, design and craftsmanship, pay tribute to both a technical command and for a life beneath, beyond and beside the sea.
- THE DUMAS: The Dumas leans on a strong, vintage 1970s inspired shape. The octagon case is bold, sturdy and offers the right frame for the bezel and dial.
- AUTOMATIC MOVEMENT: Styled from the seventies - The Dumas Automatic is powered by Japanese NH35 TMI Automatic movement, promising fuss-free, reliable timekeeping.
- THE FINER DETAILS: The Dumas Automatic features a 44mm stainless steel case with an aluminium insert unidirectional turning bezel, sapphire lens with anti-reflective coating, 20mm stainless steel strap with fold over buckle and safety lock, and water resistance of up to 300m.
- 2 YEARS INTERNATIONAL WARRANTY: Your Spinnaker watch is warranted against any manufacturing defect for a period of twenty-four (24) months from the date of purchase.
Rank #3
- SPINNAKER - OUR STORY: It is the sea and crafts that glide and dive into her waters that inspire so much of our design. The spirit of aquatic influence lies at the heart of each Spinnaker collection. Our timepieces, through a combination of material, design and craftsmanship, pay tribute to both a technical command and for a life beneath, beyond and beside the sea.
- THE BRADNER: Truly iconic, the Bradner is a captivating, performance sports watch. It is famed for its three-dimensional inner turning diver bezel and neo-vintage styling, housed in an ever reliable, robust and stylish timepiece.
- AUTOMATIC MOVEMENT: Ingenious designed framed in a vintage spirit - The Bradner is powered by Japanese NH35 TMI Automatic movement, promising fuss-free, reliable timekeeping.
- THE FINER DETAILS: Featuring a 20mm genuine leather strap, 42mm stainless steel case with a bidirectional inner rotating bezel, sapphire lens with anti-reflective coating and water resistance of up to 180m.
- 2 YEARS INTERNATIONAL WARRANTY: Your Spinnaker watch is warranted against any manufacturing defect for a period of twenty-four (24) months from the date of purchase.
Rank #2
- Premium Craftsmanship – This rugged dive watch features a robust 44mm 316L stainless steel octagonal case, offering a distinctive and durable design. The sapphire lens with anti-reflective coating ensures clarity and scratch resistance, making it suitable for both adventure and daily wear.
- Precision Engineering – Powered by the reliable Seiko NH35 automatic movement, this timepiece delivers dependable performance with smooth sweep functionality and a quick-set date. Designed for everyday precision, it’s a robust companion for the modern watch enthusiast.
- Ready for Adventure – With a water resistance of up to 300 meters (30 ATM), this watch is built to withstand deep-sea explorations and rigorous activities. The screw-down crown and exhibition case back enhance its resilience and functionality under pressure.
- Comfortable Wear – The solid stainless steel bracelet, complemented by an additional matching rubber strap, offers versatility and comfort. The fold-over buckle with safety lock and push button ensures a secure fit for any occasion.
- Inspired by the Depths – Paying homage to pioneering diver Frédéric Dumas, this timepiece combines vintage diving aesthetics with modern functionality. Spinnaker's dedication to maritime heritage is evident in the Dumas GMT, making it an ideal companion for those drawn to the sea's allure.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
