Which ones are CD 170's, and which ones are CD 170.1's? I always assumed from the ones that I've seen that the CD 170's had the straighter skirts, and the 170.1's were more angular. Looking at the PG profiles, the skirts look the same, but the wire ridge is more pronounced on a 170. The continuous drip is only listed for the CD 170.1's. Looking at just the wire ridges, I would put these as 170's on the left, 170.1's on the right. Going by my skirt analysis, that would seem to agree. However the left one has a CD. And look at the height differences! The left one is a monster at 4-5/8" tall, and it doesn't look stretched at all, as the right one does. The base diameters are, on the left, 3-5/16" and on the right, 3-1/4"

So I would say, left two are CD 170, and right two are CD 170.1? With the far left being unlisted (though possibly not unreported).