This one is an MOD-issued watch. Great provenance. Was bought in bulk by a veteran medic turned watchmaker during the time the MOD was switching to quartz, along with tons of other watches including several military issued SM300s and Omega WWW "Dirty Dozen" watches, the story of which was told in one of the milwatch forums. I was not able to take advantage and buy the Omegas at the time. Was stored in the 80s and just now recently serviced. Its in amazing original condition. I grew up during the Cold War, and these watches are a testament to those stressful times.