The British military switched to quartz chronographs with the Seiko Gen 1 in 1984; CWC competed for the contract with a new mechanical chronograph based on the Valjoux 7765, but lost out to Seiko.
According to CWC, some of these watches were subsequently issued to the Fleet Air Arm, potentially as a direct purchase from CWC rather than through the centralised MoD process.
Most of the watches seen now are those made in the 90s for the civilian market, a good example being here. However, there are some watches that appear to be from the 80s, and which share a very similar case and handset to the last issued 7733s. One of these may be a prototype or sample for the contract bid, as the NSN is not completely correct. Another has an NSN similar to the 1980 issued 7733 chronograph, and although it does not have a service code, issue number or broad arrow marking, it is tempting to think that this one could have been in the small number used by the Fleet Air Arm!
The BBC also used these watches, and those also share the 80s-style case, hands and NSN.