Omega introduced the Seamaster 300 in 1957 as part of its “Professional” line of watches. Whilst the vast majority was produced for professional and recreational divers alike, a very small batch was made for military use from 1967 until approximately 1970, and custom designed by Omega to meet the needs of members of the British Royal Army and Navy.

A number of special features set these military-issued watches apart from Omega’s regular production units. Their cases, with distinctive curved and beveled lugs, were delivered with fixed spring bars. Dials featured an encircled “T” designation, signifying the use of tritium for the luminous hour markers and hands. The broad, sword-shaped hour and minute hands, as well as the angular sweep seconds hand, were also specially designed. The crown was screw down as opposed to the snap down design as found on production versions. Their case backs were engraved by the British Ministry of Defense with the military branch code, issue number, and year of issue.

As many were used in combat and on military deployments, very few have survived with all factory military features intact. We are therefore thrilled to offer this piece in its full “mil-spec” configuration. The dial is original to the watch, still fitted with what’s known as the “thin” encircled T. Most SM 300 dials were replaced during use, and can be found with “fat” encircled T’s that were reprinted by the MOD. The luminous hour markers have faded to a pale yellow, which match the hue of the luminous numerals on the original acrylic bezel.