I'm new to the group, but not to folders! My first camera was a Retina I, bought second hand, I assure you. It still works. I've also added a Voigtlander Vitessa L, Retina IIIc, Zeiss Ikon Contessa, and a Busch baby Pressman. These all work, save the Retina IIIc, which needs shutter work. Any one have a repair suggestion?
I think my favorite of the 35mm cameras is the Vitessa, elegant, fast handling, and the f2 Ultron is killer sharp. As far as build quality it would be a toss up between the Contessa and the Vitessa. They don't build cameras like these anymore, more's the pity.