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Omega Seamaster "RAILMASTER" P.A.F Arabic 3/4 dial 1963


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Basic Info

Brand Omega
Ref. No. 135004 - 63 S.C. Staybrite steel case
Movement Manual winding
Case material Steel
Bracelet material Textile
Year 1963
Condition 2 (fine)
Gender Men's watch/Unisex
Location Canada, Victoria B.C.


Movement Manual winding
Movement/Caliber 286
Base Caliber 30 T 2
Power reserve 40 h
Number of jewels 17
Frequency 18000 A/h


Case material Steel
Case diameter 39 x 42 x 49 mm
Thickness 12 mm
Waterproof Not Waterproof
Material bezel Steel
Glass Plexiglass
Dial Black
Dial numerals Arabic numerals


Bracelet material Textile
Bracelet color Grey
Bracelet length 210 mm (110 mm / 100 mm)
Bracelet thickness 2 mm
Lug width 20 mm Size guide
Clasp Buckle
Clasp material Steel
Buckle width 18 mm


Center Seconds, Chronometer, Limited Edition, Only Original Parts


Fabulous Military markings P.A.F. RAILMASTER from 1963 the case is a very early version of the Railmaster on the dial, the trademark RAILMASTER arrow indexes [the fillings have been deteriorating over the years as it was 'live radium' ] Authenticity checked out to be from 1963 - Matching serial # of the movement calibre 286 and Matching serial # of the case. Both 20 million # details and Serial # digits will only be revealed to the end buyer.
The case has two or three large dings, but movement is a spectacularly working c.286 based on the 30 T 2 the mainstay of the Omega watch co. for many years since WW II.
The mu Metal inner case and the stainless steel outer case deflects the strongest magnetic fields up 1000 Gauss. This version is an earlier 1960's version, and the dial is stamped as a Seamaster. A RAILMASTER cannot disguise itself !

This extract below, is taken from the OMEGAMANIA Auction book that was circulated by Antiquorum in Geneve. Switzerland, circa 2007 April 17th. I have attended this unique event and have the book in my library. PTC.

The second in the famous Omega MASTER trilogy of watches the Omega RAILMASTER was aimed at professionals that worked near magnetic fields. The name RAILMASTER was chosen to reflect OMEGA’s long lasting relationship with the railways. Indeed, in the early days of train travel, the high degree of perfection achieved by Omega watches led to their being preferred by many of the world’s railways. By the 1960’s the railways were being converted to electricity, and the large electro-magnetic motors used in locomotives created a new set of problems for watches- that of stray magnetic fields, this rendered most of the watches useless. The movement of the RAILMASTER is encased by a mu Metal cage, that protects the movement up to 1,000 Gauss. Most ‘anti-magnetic’ watches are only rated to 60-80 Gauss and are therefore only suitable for resistance to slightly above normal magnetic fields. Problems due to strong magnetic fields are also encountered in laboratories, power plants, and hospitals.
The RAILMASTER was the second wristwatch to achieve a level of resistance to 1,000 Gauss. Launched in 1957, it followed the IWC Ingenieur by two years and preceded the Rolex Milgauss by one year. When launched, the Milgauss was only rated to 800 Gauss, despite the name implying that it was safe to 1,000 Gauss. It is interesting that when Rolex re-designed the Milgauss in the 1960’s it was more closely resembled to the RAILMASTER than it’s predecessor.
Other companies at the same period, such as Patek Philippe, released “Anti-Magnetic” watches. These, however, rarely exceeded a level of resistance to 500 Gauss. They were anti-magnetic due to the beryllium balance and pallet fork combined with an Invar balance spring and on an “Anti-Magnetic dust cap”. The problem with this is that beryllium contains a small amount of iron in it’s alloy and is therefore susceptible to magnetism at a certain point. This is also true of the balance spring, which, once magnetized, becomes irregular in shape and duration of pulsation, due to the coils sticking together.
The solution chosen for the RAILMASTER was to use a non-magnetic movement in conjunction wiith a double case, the outer in stainless steel and the inner in mu Metal, a non-magnetic material that “deflects” the magnetic field. The theory behind this is quite brilliant in it’s simplicity: in much the same way a compass in an iron box does not work as it is shielded from magnetic fields, the movement of the watch continues to work due to the same phenomenon. Similar to a Faraday cage, which conducts stray static charges away from sensitive electronic equipment, the cage in the watch conducts stray magnetic fields away from the movement of the watch. For example, an 8000 Gauss magnet, such as those used in the motor of a modern high-speed train, has a stray magnetic field of 500 Gauss at 6 feet, thuse any normal watch will stop functioning properly due to the movement being magnetized.
The RAILMASTER watch was revolutionary at the time of it’s creation, due in no small part to the use of mu Metal. This material, which today is commonly used in a multitude of anti-magnetic housings, was then almost unheard-of, and on the cutting edge of technology.

Size guide for wristbands

1 | Lug width

The lug width is the width of the strap at the end that is attached to the watch. This is the interior distance between the two lugs (horn-like protrusions) on the watch casing. The strap will fit your watch only if the lug width of the watch is the same width as the strap.

2 | Buckle width

The buckle width is the width of the strap at the buckle end. If you want to keep your watch’s original buckle and replace only the strap, the width of the original buckle must be identical to the strap width. For watches with folding clasps, please choose a strap specially made for your particular clasp.

3 | Strap length

The strap length is the combined length of the short strap side 3A (without buckle) and the long strap side 3B. For metal straps, the length of the strap including the clasp is measured in the closed position.

4 | Strap thickness

Strap thickness is the height of the strap. Many leather straps thin out towards the buckle end, or “taper”. If you want to keep your watch’s original buckle and replace only the strap, the strap thickness must match the height of the original buckle. For watches with folding clasps, please choose a strap specially made for your particular clasp.