
2008 Omega Seamaster Aqua Terra Railmaster
A Railmaster with a phenomenal matte black dial, a rare 36mm case, and the Omega 2403B automatic movement.
Overview
During the mid 2000s, Omega introduced a Railmaster variant within its Seamaster Aqua Terra line, drawing inspiration from the iconic reference CK2914 from 1957. Like most Aqua Terra watches of this era, the new Railmaster edition was offerred in a diverse array of sizes, including 36mm, 39mm, 41mm, and a dramatically oversized 49mm unique to this series. At that time, the prevailing trend for large watches was at its peak, resulting in the bigger options being the more popular choices while the 36mm version remained readily available even after the discontinuation of the line in 2012.
Ironically, the recent shift back towards smaller watches has led to a surge in demand for the 36mm Railmaster, making it now the most sought-after size among collectors. However, due to its limited production numbers, acquiring this specific size has become increasingly difficult. Often compared to the similarly designed Rolex Explorer I, the 36mm Railmaster, with its charming proportions and perfectly symmetrical dial, offers quite a compelling proposition for those with enough patience, persistence, and good fortune to find one.
Specifications
Brand:
Omega
Model:
Seamaster Aqua Terra Railmaster
Reference:
2504.52
Year:
2008
Case Number:
84780637
Case Material:
Stainless steel
Diameter:
36 mm
Lug Width:
19 mm
Thickness:
11.1 mm
Lug-to-Lug:
43.7 mm
Dial:
Black
Lume:
Super-LumiNova
Crystal:
Sapphire
Movement:
Automatic
Caliber:
Omega 2403B
Bracelet/Strap:
Omega 1575 stainless steel bracelet with 899 end links
Max Wrist Size:
7.5 in (19.5 links)
Hand model has a wrist size of 6.1 in
Condition
Case: The stainless steel case shows light wear, with a few hairlines, light scratches, and faint nicks present. The overall impression is clean. The faceted lugs remain thick and well-defined. The condition of the caseback is consistent with the rest of the watch, showing light wear with no major imperfections. The backs of the lugs show faint signs of prior bracelet removal. The model, brand, and serial number engravings remain sharp and detailed.
Dial, Hands, & Crystal: The matte black dial and polished hands are very well-preserved with no notable imperfections and fully functioning Super-LuminNova. The front sapphire crystal has a micro scratch near the center just below the hands. The rear sapphire crystal is squeaky clean and scratch-free.
Bracelet/Strap: The Omega stainless steel bracelet is in fantastic condition with little-to-no stretch and practically no signs of wear. The overall impression is very clean. The raised Omega logo on the clasp remains sharp and detailed.
Performance
Functions: All functions including the crown winding and time setting are working as expected.
Service History: The watch underwent a full service by Omega Japan that was completed on 08/24/2021.
What’s Included

What’s Included
Watch
Omega Seamaster Aqua Terra Railmaster on a stainless steel bracelet.
Box/Papers
Boxes, instructions, hang tag, extra links, customer service brochures, leather card holder, pictograms card, chronometer certificate card, and blank international warranty card.
Extras
Omega Japan service record dated August 2021.
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Each watch is thoroughly evaluated and guaranteed to be authentic unless explicitly stated otherwise. Prior to any sale, we are happy to provide additional photos or videos of the watch, movement, and accessories at your request. Once you receive the watch, we allow a 72-hour inspection period during which you may return the watch for a full refund if it is misrepresented.
We spend a considerable amount of time researching any watch we plan to source. This includes cross-checking the visual details, case numbers, and movements using examples sold by other reputable dealers and buying guides published by subject matter experts. We set very high standards and will not consider any watch with questionable parts or inconsistencies that cannot be verified elsewhere.
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Condition Grades
We use the following rubric to assign each watch a condition grade that best represents its external appearance.
Timegrapher Readings
These readings were taken on a Weishi No. 1000 timegrapher approximately one hour after fully winding the watch.

























