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Rare 1999 Seiko 7T27-7A20 'Gen 2' RAF/RN aircrew issue quartz chronograph

Ex-MoD, excellent condition, NOS MoD issue NATO strap included

£645.00

The Seiko 'Gen 2' won the MoD contract for an aircrew chronograph, and became the successor to the renowned 7A28 'Gen 1'. The Gen 2 contains the next generation analogue quartz chronograph movement, which in contrast to the 7A28 is largely made of plastic, but nevertheless is fully serviceable and can be stripped to its component parts for cleaning and repair. As well as a chronograph and date indicator the Gen 2 also includes a useful 24 hour indicator sub-register at the 9 position. The circled P on the dial indicates Promethium luminous compound. Seiko also produced the Gen 2 with Luminova luminous compound, indicated with a circled L on the dial, which were issued to Swedish armed forces (as well as non-lume version for use on nuclear submarines).

The Gen 2 was produced from 1993 - 2000 with a total of around 6750 supplied to the Ministry of Defence for aircrew in all arms. In 1999 an estimated 275 were supplied making it the rarest of the Promethium-dialled issued Gen 2s.

The clearly barely-used watch was disposed of by the Ministry of Defence, and has not been worn since. The watch was fully recommissioned with complete strip-down, clean and service in May 2026. Whoever buys this watch will be the first person to wear it since it was in MoD ownership.

All round an excellent example, supplied on a New Old Stock, period-correct 1990s-2000s 18mm MoD issue NATO strap.

This example is in excellent cosmetic condition - only very light signs of use with minor marks to case and case back. The dial and hands are excellent. The crystal is a replacement. Please refer to the images to make your own judgement about the condition of the watch. The images form an important part of the description

Mechanically the watch was overhauled in May 2026. The watch had a full stripdown, clean and service, with full new gasket set including OEM crystal gasket. Images of the rebuild have been included in the listing.

The case parts were stripped including removal of the pushers, and ultrasonically cleaned. The pusher gaskets have been replaced, greased and the pushers refitted. The movement was fully stripped, mechanically and ultrasonically cleaned using waterless solutions and hot air dried. The movement was rebuilt and lubricated in accordance with the Seiko technical manual and a new 395 battery was fitted.

The watch has been fully tested and is in full working order with all functions operating correctly including chronograph start, stop and reset, 24 hour indicator register, date quickset and automatic date advance, and manual chronograph start position adjustment.

The watch is absolutely suitable for everyday use, but it is vintage watch so is not recommended for sports or use in extreme conditions. The watch has not been pressure tested so water resistance is not guaranteed. This watch is covered by our waterproof 6 month guarantee.