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The Encyclopedia of Horology

Wristwatch · Diver's wristwatch

Seiko MarineMaster Professional Diver's Bracelet Watch

Partially verified

This Seiko MarineMaster Professional is a limited edition stainless steel diver's bracelet watch, catalogued as number 106 of 200. Sold from part one of a collection of Japanese wristwatches, it features a 45mm stainless steel case fitted with an automatic calibre 8L35 movement. The dial is finished in a sky blue guilloché pattern and includes a date display at the 3 o'clock position alongside luminous hour markers. The watch is mounted on a matching stainless steel bracelet and was catalogued as accompanied by the maker's presentation box, swing tag, guarantee card, manual, watch tool, and an additional rubber strap.

Front view of the Seiko MarineMaster Professional diver's wristwatch on stainless steel bracelet
Front view of the Seiko MarineMaster Professional diver's wristwatch on stainless steel bracelet — Bonhams. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
www.bonhams.com
Category
Wristwatch · Diver's wristwatch
Maker / attribution
Seiko
Reference
SLA015/1 LE
Catalogue / lot identifier
740
Source-reported date
Circa 2016
Country
Japan
Source-reported serial
106/200

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

Identity and Catalogued Model Details

This wristwatch is catalogued by Bonhams under the model reference 'SLA015/1 LE' in the lot specifications and as 'Ref.SLA015J1' in the primary lot title, under the series designation 'Prospex'. It is documented as a limited edition example, catalogued as 'Limited Edition 106/200', with an approximate production dating of circa 2016.

The timepiece was offered as Lot 740 in the auction 'Making Waves: Seiko - A Private Collection of Japanese Wristwatches | Part 1' held in Hong Kong in August 2020. The auction heading describes the lot as a 'MarineMaster Professional' diver's bracelet watch, though seller claims such as 'New Old Stock' reflect auction marketing and are not independently verified.

Evidence for this section
  • “Model/Ref: SLA015/1 LE”
  • “'Prospex', Ref.SLA015J1, No.106/200”
  • “Limited Edition 106/200”
  • “Making Waves: Seiko - A Private Collection of Japanese Wristwatches | Part 1”

Case, Bezel, and Bracelet Observations

The watch features a stainless steel case recorded in the cataloguing at 45mm in diameter. Direct visual observation shows the winding crown positioned at approximately 4 o'clock, paired with a matching multi-link stainless steel bracelet.

The dial is bordered by a black rotating diver's bezel bearing silver-tone minute calibrations. Neither the case back nor internal case structure is visible in the provided lot photography, leaving case back stamps and serial engravings unconfirmed from the image alone.

Evidence for this section
  • “Case: 45mm”
  • “Stainless steel case with crown positioned at approximately 4 o'clock”
  • “Matching multi-link stainless steel bracelet”
  • “Black rotating diver's bezel with silver-tone minute calibrations”

Dial Configuration, Movement, and Reported Accessories

Visual observation shows a light blue textured wave-pattern dial with broad hands, applied luminous hour markers, and a date display window at 3 o'clock; the auction catalogue describes this dial as 'Sky blue guilloché'.

Internally, the movement is reported by the auctioneer as 'Calibre: 8L35, Automatic'. In addition, the cataloguing notes the watch was accompanied by a presentation box, swing tag, guarantee card, instruction manual, watch tool, and an extra rubber strap, though these accessories and the movement mechanism are not depicted in the primary photograph.

Evidence for this section
  • “Light blue textured wave-pattern dial with applied luminous hour markers and broad hands”
  • “Date window positioned at 3 o'clock”
  • “Dial: Sky blue guilloché”
  • “Calibre: 8L35, Automatic”
  • “Accompaniments: Maker's presentation box, swing tag, guarantee card, instruction manual, watch tool and additional rubber strap”

Open research questions

  • How is the limited edition numbering formatted on the physical case back (e.g., '106/200')?
  • Does the case back text read 'SLA015J1' or 'SLA015'?
  • What country or retailer code is indicated on the reported guarantee card?

Source evidence

Recorded claims and source quotations for Seiko MarineMaster Professional Diver's Bracelet Watch
FieldSource-reported valueSource quotation
Model ReferenceSLA015/1 LE“Model/Ref: SLA015/1 LE”
Limited Edition Number106/200“Limited Edition 106/200”
Movement Calibre8L35, Automatic“Calibre: 8L35, Automatic”
Dial DescriptionSky blue guilloché“Dial: Sky blue guilloché”
Case Size45mm“Case: 45mm”
Realized Auction PriceHK$28,050 including buyer's premium“Sold for HK$28,050 inc. premium”
Auction Session and LocationHong Kong, Six Pacific Place, 7–25 August 2020“7 – 25 August 2020, 18:30 HKT Hong Kong, Six Pacific Place”
Reported Movement Calibre8L35, Automatic“Calibre: 8L35, Automatic”

Visible details

  • Light blue textured wave-pattern dial with applied luminous hour markers and broad hands
  • Black rotating diver's bezel with silver-tone minute calibrations
  • Stainless steel case with crown positioned at approximately 4 o'clock
  • Matching multi-link stainless steel bracelet
  • Date window positioned at 3 o'clock

Research qualifications

  • The case back and movement are not visible in the provided image.
  • Listed accompaniments such as the box, extra rubber strap, tool, and guarantee card are not depicted in the primary photograph.

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

Consulted source

Bonhams : Seiko. A Stainless Steel Automatic Diver's Calendar Bracelet Watch, 'Prospex', Ref.SLA015J1, No.106/200, With Box, Guarantee, Manual and Extra Strap

Reviewed 2026-10-21 · Record 2abd522f56

Terms in this record

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

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