Seiko 7A28-7120 (RAF Gen 1)
The 7A28-7120 is commonly called the RAF Gen 1.
The Seiko 7A28-7120, widely known among collectors as the RAF Gen 1, is a legendary military watch issued to the British Royal Air Force from 1984 to 1990. Powered by the caliber 7A28, which holds the distinction of being the world's first analog quartz chronograph movement, this reference is highly prized for its historical significance and robust, fully jeweled metal gear train. The 37mm sandblasted stainless steel case features fixed lug bars for a NATO strap, while the matte black dial displays a circled "P" indicating the use of Promethium lume. Approximately 11,300 pieces were supplied to the Ministry of Defence during its production run. The combination of pioneering quartz technology and genuine military provenance makes the 7A28-7120 a cornerstone of both Seiko and military watch collecting.
| Caliber | 7A28 |
|---|---|
| Years | 1984 to 1990 |
| Line | Military |
| Function | Chronograph |
| Case size | 37mm |
| Crystal | Hardlex |
What does the circled "P" on the dial signify?
The circled "P" indicates the use of Promethium, a mildly radioactive luminous material specified by the British Ministry of Defence for nighttime legibility.
How can I tell what year a Seiko RAF Gen 1 was issued?
While the standard Seiko serial number provides the manufacturing date, the military engravings on the caseback include a two-digit number following a slash (e.g., / 89), which represents the exact year the watch was issued by the MoD.
