Ta @MCamb, @Poetic, I didn't look at it closely and yes the top nut does look older. Off to book an opticians appointment :)
Or is it a Centaur? I think they might have used that type of locknut on the C-Record era type headsets?
Think centaur was introduced in the early 00's
By this time they were marking the headsets with 'record' 'chorus' etc..?
@Poetic started
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Ta @MCamb, @Poetic, I didn't look at it closely and yes the top nut does look older.
Off to book an opticians
appointment :)