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The Encyclopedia of Horology

Wristwatch · Diver wristwatch

Spinnaker Dumas Automatic 300M Diver Wristwatch SP-5081

Partially verified

The Spinnaker Dumas reference SP-5081 is an automatic diver wristwatch dated by the source to the early 2020s. Built in an angular 44mm octagonal stainless steel case, the design incorporates a unidirectional rotating bezel with luminous markings, a screw-down crown, and a reported water resistance rating of 300 meters. The blue dial features luminous baton hour indices, a framed date window at 3 o'clock, and an oversized orange minute hand alongside a white hour hand. The source reports that the piece is powered by a 24-jewel Japanese Seiko NH35 automatic movement and mounted on a stainless steel Milanese mesh bracelet.

Three-quarter view of the Spinnaker Dumas diver wristwatch SP-5081 on mesh bracelet
Three-quarter view of the Spinnaker Dumas diver wristwatch SP-5081 on mesh bracelet — SECOND HAND HOROLOGY. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
www.secondhandhorology.com
Category
Wristwatch · Diver wristwatch
Maker / attribution
Spinnaker
Reference
SP-5081
Catalogue / lot identifier
WA-5106
Source-reported date
early 2020's
Source-reported place
Japan

Source-reported attribution and specifications are not independent authentication. A listing does not establish present ownership, current display, availability or permission to reproduce.

Object description

Case Construction and Exterior Dimensions

The Spinnaker Dumas reference SP-5081 is built with an octagonal stainless steel case. According to the seller's measurements table, the case diameter is 44 mm (48.4 mm including the screw-down signed crown), with a lug-to-lug distance of 48 mm, a thickness of 15 mm, and a lug width of 22 mm. The bezel is described as a blue unidirectional turning bezel with luminous calibrations, protecting a sapphire crystal.

The watch is fitted to an original stainless steel Milanese mesh strap. The vendor reports 300 meters of water resistance (30 ATM / 1,017 feet) and notes a display case back, though neither the case back nor internal mechanisms are pictured in the provided visual record.

Evidence for this section
  • “44mm octagonal stainless-steel case shape and display case back”
  • “Case 44 Case w/Crown 48.4 Case Lug to Lug 48 Case Thickness 15 Lug Width 22”
  • “blue uni-directional turning bezel with luminous calibrations, a sapphire crystal”
  • “original stainless steel Milanese mesh strap that offers a customizable fit for your wrist”
  • “offers 300 meters of water resistance (30 ATM/1,017 feet)”

Dial and Hands

The blue dial features applied baton hour markers reported by the seller to utilize Swiss SuperLuminova, accompanied by a white peripheral minute/second track and a date indicator at the 3 o'clock position. The Spinnaker name and logo are printed at the upper dial.

Visual observation confirms an oversized bright orange minute hand paired with a white baton hour hand and a slender sweep seconds hand.

Evidence for this section
  • “Blue dial with applied luminous baton hour markers and date window at 3 o'clock”
  • “Oversized bright orange sword/plongeur-style minute hand paired with a white baton hour hand”
  • “Swiss SuperLuminova batons hour marks for increased low light legibility and a white minute/second track”
  • “date display is located at 3 o'clock and the Spinnaker name/logo is prominently displayed at the top”

Reported Movement and Documentation

The seller reports the internal movement to be a Japanese automatic caliber Seiko NH35 (SII/TMI NH35A), listing 24 jewels, a sweep second hand, hacking seconds, a 41-hour power reserve, and an operating frequency of 21,600 vibrations per hour. The seller's table records the movement inscription as 'SPINNAKER 24 Jewels Japan Movement' and case back markings as 'SPINNAKER Automatic Movement ALL Stainless Steel Water Resistant 300M Sapphire SP-5081'.

The vendor dates the watch to the 'early 2020's' and states that it comes complete with original box and papers. However, neither the movement, case back markings, box, nor papers are depicted in the single listing photograph.

Evidence for this section
  • “automatic movement caliber Seiko NH35 (SII/TMI NH35A), featuring 24 jewels, a sweep second hand, a date indicator, hacking seconds, a 41-hour power reserve, and a frequency of 21,600 vibrations per hour. Made in Japan.”
  • “SPINNAKER 24 Jewels Japan Movement”
  • “SPINNAKER Automatic Movement ALL Stainless Steel Water Resistant 300M Sapphire SP-5081”
  • “dated from the early 2020's. This watch comes complete with its original box and papers.”

Open research questions

  • What specific purchase date or retailer stamp is recorded on the warranty paperwork to substantiate the reported early 2020s dating?
  • Does the unpictured display case back reveal a branded Spinnaker rotor or standard Seiko/TMI NH35 markings?
  • What clasp mechanism and clasp markings are present on the stainless steel Milanese mesh strap?

Source evidence

Recorded claims and source quotations for Spinnaker Dumas Automatic 300M Diver Wristwatch SP-5081
FieldSource-reported valueSource quotation
ReferenceSP-5081“reference SP-5081”
Movement CaliberSeiko NH35 (SII/TMI NH35A)“automatic movement caliber Seiko NH35 (SII/TMI NH35A)”
Case Diameter44mm“44mm octagonal stainless-steel case shape”
Water Resistance300 meters (30 ATM/1,017 feet)“offers 300 meters of water resistance (30 ATM/1,017 feet)”
BraceletStainless steel Milanese mesh strap“original stainless steel Milanese mesh strap”
Movement InscriptionSPINNAKER 24 Jewels Japan Movement“SPINNAKER 24 Jewels Japan Movement”
Case Back MarkingsSPINNAKER Automatic Movement ALL Stainless Steel Water Resistant 300M Sapphire SP-5081“SPINNAKER Automatic Movement ALL Stainless Steel Water Resistant 300M Sapphire SP-5081”
Case Dimensions44 mm case, 48.4 mm with crown, 48 mm lug-to-lug, 15 mm thickness, 22 mm lug width“Case 44 Case w/Crown 48.4 Case Lug to Lug 48 Case Thickness 15 Lug Width 22”
CrystalSapphire“a sapphire crystal”

Visible details

  • Octagonal stainless steel case with brushed facings and polished bevels
  • Blue dial with applied luminous baton hour markers and date window at 3 o'clock
  • Oversized bright orange sword/plongeur-style minute hand paired with a white baton hour hand
  • Calibrated dark dive bezel with luminous numerals and top triangle marker
  • Fitted with a stainless steel Milanese mesh bracelet

Research qualifications

  • Case back and internal Seiko NH35 movement are not shown in the provided photograph
  • Reported original box and papers are not visible in the image

Photograph identity and source facts were screened before import; rights clearance remains pending.

Consulted source

SPINNAKER Dumas Automatic Watch SP-5081 300M Diver Wristwatch - ALL Or – SECOND HAND HOROLOGY

Reviewed 2026-10-21 · Record 9f2eba1ed9

Terms in this record

Glossary explanations for terms named in this object’s record.

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