Thank you, Nick, for pointing out the obvious!
I was so fascinated by the foreground that I didn't even look behind it... (I've done that before, and will no doubt do it again)
I also took a new look at my pressed glass, and lo and behold: all of it which has a "foot ring" alos had said foot-ring planed. (and most of the non-ringed (is that a word?) pieces has a faint pontil scar, probavly from a sanded pontil/punty)
Kerstin, who learns something new every week - most of it is in the eye of the beholder