CW ID: 1269223 | Seiko ID:

Seiko Prospex Marinemaster 300 Blue Dial, Boxed 970271

$1,995.00 USD Out Of Stock
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About This Watch:


The Seiko Prospex Marine Master 300M Ref SLA023 continues Seiko’s rich dive watch history with an aesthetic design that is reminiscent of early 6215 models. Modern updates include a ceramic bezel, a sapphire crystal, a monoblock case, and a Calibre 8L35 movement.

The History: Seiko first entered the dive watch market in the 1960s after a request from a local diver to build something that could hold up during deep sea dives using diving capsule & saturation techniques. His complaint was that most watches would malfunction and become damaged upon reaching greater depths. The answer to this request was for Seiko to establish a development team to design a timepiece that could perform reliably under the extreme conditions of deep-sea diving, and they did so magnificently.

The Watch: One of the most notable characteristics of the Prospex Marine Master SLA023 is the monoblock case that is polished using the Zaratsu Polishing Technique, which is a mirror blade polishing technique performed at the Grand Seiko manufacturing facility. The case is then treated with Seiko’s DiaShield coating to prevent scratches during wear. The SLA023 has a sapphire crystal and features a Caliber 8L35 movement based on Grand Seiko’s 9S55 movement. The blue dial features a sunburst pattern with brushed metal hands that are filled with Seiko’s own Lumibrite luminescence composition, as are the number plots. A date window is featured at the 3 o’clock position. The SLA023 has a 50-hour power reserve and a water resistance rating of 300 meters.

The Details: This Seiko Prospex Marine Master 300M SLA023 is in very good condition. The case and crystal are in excellent condition, and the stainless steel bracelet has slight wear markings on the clasp, which are visible in the photos. This timepiece comes with an outer sleeve, inner and outer boxes, instruction manual, manufacturer warranty booklet, warranty card, registration booklet, hang tag, and additional rubber strap.

Product information

We appreciate and encourage the resale of pre-owned gear. Well made gear is built to last, and despite a rapidly evolving market, frequent upgrades, and some companies phasing out gear quickly, we aim to constantly find new lives for pre-owned items. We are committed to ensuring the pre-owned gear you purchase from Camera West is in a condition that promises reliability for years to come.

Testing & Inspection

Each piece of pre-owned gear undergoes extensive testing and inspection to ensure it's in good working order. We meticulously note the finer details of an item's condition or function to maintain transparency. This attention to detail may deter some buyers when we mention "minor dust" in a lens, or "faint edge wear" on an otherwise mint condition camera. However, we note these details out of our responsibility to provide an accurate and wholistic representation of the item to you.

Real Photos & Description of The Specific Item

We provide a photo of each pre-owned item for sale, refusing to use generic images. Despite the time, effort, and cost saved, we consider using generic images dishonest. Each pre-owned item you view on our website includes specific photos and description written up by a real person, and photographed in house before we publish an item for sale.

24hr Inspection Period

All pre-owned items come with a 24-hour inspection period (beginning once the item is delivered) to ensure the item arrives as described. If any issues arise, we request you contact us immediately at support@camerawest.com so we can address the problem.

Our Cosmetic Condition Grading

All of our pre-owned items will contain a grade. This grade is a reflection of the cosmetics of an item only. (mechanics and function are noted in the description)

  • 10- LIKE NEW | Item shows no visible signs of use. Usually includes some, if not all, of the original packaging. Item can be considered like new.9+VERY GOODItem shows very slight handling wear. Item is almost new, but used lightly.
  • 9 GOOD | Item shows minor handling wear, usually shows some signs of edge wear.
  • 8+ AVERAGE | Item shows regular signs of use, some edge wear, and normal cosmetic marks from general use.
  • 8 BELOW AVERAGE | Item shows significant wear from normal use. Some paint loss, and edge wear. Regular cosmetic marks are visible.
  • 7+ ACCEPTABLE BARGAIN | Item shows nominal signs of heavy use. Significant paint loss, edge wear and cosmetic marks are visible throughout the item.7AVERAGE BARGAINItem shows significant signs of heavy handling. Significant paint loss, edge wear, and visual marks can be seen throughout the item.
  • 6+ EXTREME BARGAIN | Item shows extreme signs of heavy handling. Extreme paint loss, edge wear and visual marks can be seen throughout the item.

All our shipments are fully insured. For shipments valued over $150, a direct signature will be required upon delivery.

We utilize various shipping carriers, with FedEx Express being our primary choice for 2-Day and Overnight shipping within the US, as well as International deliveries.

We accept returns within 14 days of delivery, subject to a restocking fee of up to 15%. This fee is not for profit, but to cover the costs associated with selling an item. Each return is evaluated individually, and we strive to minimize this fee. In many instances, we waive it entirely if the refund credit can be applied towards another item in the store.

Please note, all returned items must be in the condition in which they were shipped. If the items are returned in a different condition, we will not be able to accept them.

Every item we sell comes with a pre-owned warranty.

Unless noted as "AS IS", all items come with a 90-day warranty through Camera West. This warranty does not cover theft, improper use, fire or water damage, or any issues unrelated to the item functioning as intended by the manufacturer.

If you need to utilize the warranty, please contact us directly at support@camerawest.com to open a support ticket. This allows us to assist you effectively with the repair of your item. We do not accept receipts from repairs conducted without our consent. We need to manage the repair and inspection process from start to finish to ensure the issue is properly resolved and the product is returned to you in working condition.

Please note that vintage gear may require extra patience. Despite thorough inspection and testing, these items, like vintage cars, may develop issues due to their age. Even the most beautifully restored vintage items may have minor issues. They are no longer new and should be treated with special care and attentio

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