Seiko quartz chronograph 7t32-7a20 - Sold at Auction - 212925256
Seiko 7T27-7A20 Aug '93 Gen 2 RAF chrono type (non-issued) The dial is illuminated by Promethium. The case measures 38mm across, excluding the crown. | WatchUSeek Watch Forums
Harry's Vintage Seiko Blog: Seiko Gen 2 7T27-7A20 1995 British Royal Airforce (RAF) Military Issued chronograph
1985 Seiko 7T27-7A20 UK Royal Air Force-Issued Gen 2 Chronograph | DC Vintage Watches