As you probably know, that's a Sturmey-Archer factory date code, May 1986. Back in the day, the hub would have been shipped from GB to Taiwan and subsequently built into a bike some months later.
The venerable Sturmey AW hub has three speeds, and that gave this model Dahon its name, Classic III. The Classic V had a five speed derailleur drivetrain, the Classic I was a single speed.
I really appreciate you sharing your knowledge... Also thanks for solving my mystery with your pictures!