Omega Railmaster Seamaster Aqua Terra 150M Co-Axial 42.2 Railmaster / Black Alligator

Reference 2802.52.31

About this watch

The Omega Seamaster Aqua Terra 150M Co-Axial 42.2 Railmaster / Black Alligator (model 2802.52.31) is a luxury timepiece that embodies precision and innovation, blending the sporty essence of the Railmaster with the elegance of a dress watch. Crafted from high-quality stainless steel, the case feels robust and durable, featuring a sapphire crystal that's scratch-resistant and an open case back revealing the intricate movement inside. This automatic movement, Omega's caliber 2403, is designed for accuracy and reliability, with a Co-Axial escapement reducing friction and increasing longevity. With a power reserve of 48 hours, you can comfortably take this watch off for a weekend without worrying about winding it. The precision is top-notch, ensuring you're always on time. This watch is surprisingly lightweight, making it perfect for all-day wear. The black alligator strap adds a touch of sophistication, making it versatile enough for both formal and casual settings. Whether you're in a suit or a casual t-shirt, the Omega Seamaster Aqua Terra 150M Co-Axial enhances your style without being overpowering. With its timeless design, reliable movement, and versatility, it's an investment that will serve you well for years to come.

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MSRP: $2,900

Market Price: $2,594

Key Features

Omega caliber 2403 automatic movement
Sapphire crystal scratch-resistant
Water resistance up to 150 meters
42.2 mm diameter stainless steel case
48-hour power reserve
Co-Axial escapement for increased longevity

Specifications

Brand

Omega

Family

Railmaster

Model

Seamaster Aqua Terra 150M Co-Axial 42.2 Railmaster / Black Alligator

Reference

2802.52.31

Movement

2403

Movement Features

Hours, Minutes, Seconds
Co-Axial Escapement, Chronometer

Case

Stainless Steel 42.2mm

Dial Color

Black

Crystal

Sapphire

Water Resistance

150

Current Listings

Omega Railmaster 36 2504.52

Omega - 2504.52 · $6,000

A 36mm Omega Railmaster from 2007 in excellent condition with a few age-related imperfections.

Condition: Excellent with some minor cosmetic damage and potential servicing needed
Year of production: 2007
Case size: 36mm
Crown threads issue: Yes (may need servicing)

Posted at

May 27, 2026, 11:46 PM

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Omega Railmaster 2803.52.31 Full Set with Box & Papers, Freshly Serviced

Omega - 2803.52.31 · $2,925

This Omega Railmaster from the early 2000s features a classic 39.2mm design, dating back to 2006. The watch has been recently serviced and comes with a brand new grey leather strap.

Condition: Superb
Year: 2006
Case size: 39.2mm

Posted at

May 26, 2026, 6:42 PM

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View listing on r/WatchExchange

Omega Railmaster 2502.52 41mm - $2,490

Omega - 2502.52 · $2,490

Up for sale is my great condition Omega Railmaster 2502.52, This watch measures at 41mm and has an automatic Omega 2403 movement.

Condition: Very good condition for its age
Case size: 41mm diameter
Movement: Automatic Omega 2403

Posted at

May 24, 2026, 10:01 PM

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Omega Railmaster. Clean. Full kit.

Omega - Railmaster · $2,795

The Omega Railmaster is a full kit with box and papers, available for sale from WatchExchange Enterprises in NJ USA.

Box papers: true

Posted at

May 23, 2026, 10:28 AM

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40mm Omega Seamaster Railmaster Black Dial - Ref 220.12.40.20.01.001 - FULL KIT (Box & Cards)

Omega - 220.12.40.20.01.001 · $2,500

The Omega Seamaster Railmaster features a black dial with vertical linear-brushed texture, recessed vintage-colored lume markers, and a signature 'lollipop' seconds hand. It has been an honest daily-wear tool watch.

Condition: Daily-wear tool watch with visible scuffs on the bezel and top-left lug
Movement: METAS-certified Calibre 8806

Posted at

May 22, 2026, 11:28 AM

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Omega Railmaster 2503.52 39mm - $2,490

Omega - 2503.52 · $2,490

This Omega Railmaster 2503.52 is a steel cased watch on an original Omega Steel bracelet, featuring a sapphire crystal and a dial with minor damage.

Condition: 8.9/10 - minor damage on dial, patina on hands, minimal hairlines
Case Size: 39mm diameter
Bracelet Size Fit: up to 7-7.25 inch wrists depending on wrist shape
Shipping Method: Fedex Priority Shipping

Posted at

May 22, 2026, 4:11 AM

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Omega Railmaster 2502.52 41mm - $2,590

Omega - 2502.52 · $2,590

Up for sale is my great condition Omega Railmaster 2502.52, measuring at 41mm with an automatic Omega 2403 movement.

Condition: Very good condition for its age
Case size: 41mm
Movement type: Automatic
Bracelet material: Steel

Posted at

May 17, 2026, 9:36 PM

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price reduction! 2026 Full Set Omega Railmaster 235.10.38.20.06.001

Omega - 235.10.38.20.06.001 · $3,999

This Omega Railmaster features a 38mm steel case with a gray gradient dial and is available for sale in excellent pre-owned condition. The watch includes a full set of accessories, making it an attractive option for those looking to purchase this model.

Condition: excellent pre-owned condition
Case size: 38mm diameter
Bracelet material: steel
Dial color: gray gradient

Posted at

May 14, 2026, 4:47 PM

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Omega Railmaster - 220.10.40.20.03.001 - Blue - Steel - 40mm - Mint

Omega - 220.10.40.20.03.001 · $3,795

This Omega Railmaster is a pre-owned, mint condition watch with a blue dial and stainless steel case. It has a 40mm diameter and features an automatic movement.

Condition: Pre-Owned - Mint
Case Size: 40mm diameter
Bracelet Type: Stainless Steel
Movement Type: Automatic

Posted at

Mar 10, 2025, 12:58 AM

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View listing on RolexForums