Greetings,
I picked up this 20" used cymbal yesterday (it actually measures 19.5")
The Atlas stamp is in the same "mountain range" shape that I see older UFIP stamps in. I know that Atlas cymbals were advertised in Modern Drummer Magazine back in the 80's.
It appears to be a B8 cymbal as far as color, but it doesn't sound like one. It sounds very much like on old A. to my ears. It doesn't have that high pitched "hiss" (especially after it starts to decay) that is usually present on B8 cymbals. In fact, the music store I bought it from had two 20" older A's and I preferred this Atlas to both of the older A's. The Atlas is lighter, more airy and is less harsh when crashed than the older A's.
This cymbal also reminds me of a similar cymbal I used to have that just had "CB-700" stamped on it. Same color and lathing. I always regretted selling that cymbal (that one also measured 19.5"). This one sounds even better than that one, so I got lucky!