A highly venerated Seiko Marine Master 300, purchased new in 2021 and including a full kit, warranty card, and all bracelet links.

• Condition: Excellent
• Purchase year: 2021
• Warranty status: Under warranty
• Origin: Purchased from Gnomon

The Seiko SLA021/SBDX023 is a favorite among purists due to its iconic 'Marinemaster' dial text and unsigned crown. It features the upgraded MEMS 8L35 movement and Diashield protection.

• Condition: Great original & unpolished condition, showing signs of wear on bracelet and a ding on case side
• Movement: Cal. 8L35 Hi-Beat (28,800 vph), 50hr Reserve, Hacking/Hand-winding
• Dimensions: 44mm diameter, 14.6mm thickness, 50mm lug-to-lug
• Inclusions: Original boxes and papers, all links and extra rubber strap

The SBDX023 is a modern iteration of the legendary MM300, powered by the workhorse 8L35 movement and built like a tank.

• Condition: Fantastic condition
• Movement: Automatic w/ manual winding - Caliber 8L35
• Case material: Stainless steel
• Bracelet material: Diashield coated stainless steel

This Seiko Prospex Marine Master 300M is a high-quality dive watch with excellent condition. It comes with its original box, an unused rubber strap, and a booklet. The ceramic bezel is perfect, but there's a small ding on the edge near the 7 marker.

• Condition: Excellent
• Bracelet material: Metal
• Water resistance depth rating: 300m

A discontinued Seiko SBDX023 Marinemaster MM300 with a black dial, ceramic bezel, and sapphire crystal. It features the 8L35 movement and is complete with everything delivered by Seiya.

• Condition: New in box/never worn (NIB/NOS)
• Movement: 8L35
• Crystal: sapphire

A discontinued Seiko SBDX023 MM300 model with a black dial and ceramic bezel. It features an 8L35 movement and comes complete with everything delivered by the original seller.

• Condition: New, unworn (NIB/NOS)
• Material: Ceramic
• Crystal: Sapphire Crystal
• Movement: 8L35

A new, unworn example of the discontinued Seiko SBDX023 MM300, one of the last models produced by Seiya before he closed down.

• Condition: New In Box (NIB)
• Movement: 8L35
• Bezel material: Ceramic

The Seiko Marinemaster 300 SBDX023 is a dive watch with a 41mm diameter case, featuring a unidirectional rotating bezel.

• Model name: Marinemaster 300

A gently used Seiko MM300 with excellent condition and all original packaging, ready to wear or collect. The watch has been well cared for and shows minimal signs of wear.

• Condition: Seldom worn, 95% plus condition watch head, OEM rubber strap 90%
• Condition Of Bracelet: like new
• Inclusions: all packaging, paperwork, hang tags, spare bracelet links, brand new OEM rubber strap