Newby to Bromptons
I'm new to folding bikes. I'm recovering from bilateral below the knee amputations, and am riding a borrowed Brompton 5 speed from the late 90's (with a dynamo) I'm thinking I'd like to get one, but I don't know much of anything about the evolution of the Brompton. What's different about one that's 20 years old versus 10 years old? Not seeing very many of them showing up on Ebay, every now and then on Craigslist, but none on the marketplace here. Looking for recommendations and education I guess.
(If I missed some basic stuff in previous message, please forgive me)