Dahon Classic III, I have two of them. Shoot me a PM with your email and I will send you a pdf copy of the owner's manual. To get the handlebar to fold all the way down you have to lower the top part of the mast first.
What type of hub is on yours? If it is a Sturmey-Archer there will be a date code on it.
Here are pictures of my two. I have one red one and one blue, both are 1984 models but they aren't identical. ThorUSA has fenders that will fit them.
Aaron