@Dug as previously mentioned MWR forum is a good starting point for research - this website is a great resource, and may help spark some memories of which model you had.
https://cwcaddict.com
As you were in the Fleet Air Arm, you may have been lucky enough to have been issued a pilots chronograph (with the subsidiary dials) Hamilton started manufacturing these in the late 60s, Lemania was also an important supplier prior to that. Both have become very sought after with commensurate price increases.
Based on your description of a manual wind watch without any sub dials, I wonder if you had a Hamilton like this - those issued to the RAF had the 6BB code stamp on the caseback, but Fleet Air Arm may have had the Royal Navy 0552 stamp.