So it was quite interesting when these vintage hose came up on Ebay the other day. Yes there are the familiar split diamonds but also double lines and triple lines:
I see seams at the backs. And while the toes and heels seem to be blended into the material, it does seem odd that the back of each sock is stitched together. This may suggest that these were not regular knit hose. And to my (admittedly untrained) eye, the material itself doesn't even look like a knitted pattern. It looks more like jersey material.

How "vintage" were these supposed to be?