Having cawfee with Rich this morning, he of R'dell wheel building fame, I found out the difference between my 2 Atlantis's. (Yeah, yeah, I know...it's hard to bitch when you have a loaf of bread under each arm...)
So, Atlantises made by Toyo have chainstays that flare Out at the drop-outs, whereas the Taiwan and Waterford chainstays are straight from their bend out of the bottom bracket. The presence of a plate between the chainstays for a generator or kickstand doesn't help identifying the constructor.
Hope it helps. Btw, share the bread...we're all in this together.