There's a fella selling a two-register CWC chronograph with date window on a French forum claiming, in good faith I would say, that it is a Fleet Air Arm issued watch from the 90s. It looks to me like a civilian model sold by Silverman's, in fact like the one I own, albeit mine is dateless but with a ghost position on the crown. He is basing his claim on this website linked in the sales post.

Is this information accurate? The website states that these watches are Fleet Air Arm issued watches, and that the BBC also used the same watches which also had a NSN number. It seems strange to me, but perhaps it is correct, what do you think?

https://cwcaddict.com/chronograph-mech7765