Chinese-made 2500s of the late '80s

[deedubya3800]

What can be said about them? Custom manufactured for AT&T, labeled as the "Traditional 100". The model number usually goes something like CS2500DMGF. They carry K-series handsets and bear little to no resemblance to the earlier 500 and 2500 series from the bottom. What do they look like on the inside? Do they even have real ringers? Were they built worth a flip?