Calls have a fascinating history, actually! They're considered the oldest domestic breed; so old in fact, we aren't entirely sure where they originated. We think somewhere in Asia, and then they eventually ended up in Europe, where their popularity took off. The fact that the breed is so ancient is also why pure calls tend to breed true. Some have tried to breed "quiet calls" but failed miserably.

Also can't say if the forerunners were as cute and pudgy, but I'm gonna say that no, they weren't. Back then the only thing that mattered was size and noise factor. If you look at old-school shar peis, pugs, bulldogs and the like, they looked NOTHING like their modern counterparts!
As for quality, of course a low-quality call makes a great pet! The breed standards are mostly cosmetic, anyhow. Mostly. If you do get a low quality bird or a cross, it may not be quite as cute but it will still be just as cuddly. <3