
2007 Omega Seamaster Aqua Terra Railmaster
A Railmaster with a striking black dial, a rare and minty 36mm case, and the Omega 2403 automatic movement.
Overview
The Omega Aqua Terra Railmaster was produced in the mid 2000s and came in four different sizes: 36mm, 39mm, 41mm, and a whopping 49mm. At that time the large watch trend was reaching its peak, and so one might imagine that the 39mm, 41mm, and 49mm were initially the more popular buys. But, as history would have it, the trend back towards smaller watches in the 2010s has made the 36mm the most sought after size today by collectors. And, due to a short production run of the entire line, it has become a rather difficult watch to attain. Will it reach the pricing and collectibility of a certain other black-dialed sport watch from Rolex that it shares many characteristics with? Time will tell, but for now the 36mm Railmaster still remains a relative bargain for those who have enough patience, persistence, and luck to find one.
Specifications
Brand:
Omega
Model:
Seamaster Aqua Terra Railmaster
Reference:
2504.52
Year:
2007
Case Number:
81699845
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 2403
Bracelet/Strap:
Omega 1575 stainless steel bracelet with 899 end links
Max Wrist Size:
8in (22 links)
Hand model has a wrist size of 6.1 in
Condition
Case: The case is in absolute mint condition, with virtually no signs of wear outside of a few small hairlines. The twisted lugs are nice and sharp, and retain excellent definition between brushed and polished surfaces. The polished bezel is very clean, and blemish-free. The case back engravings are deep, sharp, and clear.
Dial, Hands, & Crystal: The dial and hands are minty with no signs of aging and fully functioning Super-LumiNova. The front crystal contains a very small mark on the underside at the 8 o'clock position that's likely a tiny scratch to the AR coating.
Bracelet/Strap: The fully linked Omega stainless steel bracelet shows no stretching and practically no signs of wear, with a sharp Omega logo at the clasp.
Performance
Timing: The watch has been manually observed over a 24-hour period and appears to be running normally.
Functions: All functions including the crown-winding and time-setting are working as expected.
Service History: The watch was last serviced in June of 2021 by the previous owner.
What's Included
What's Included
Watch
Omega Railmaster on a stainless steel bracelet.
Box/Papers
Outer and inner boxes.
Extras
Second-hand purchase documentation from Swatch Japan dated 2008.
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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.














