It has light to moderate base wear, so if it's recent, it's not "new new." I have as few bona fide 1950s pieces of art glass with no wear at all, so I suppose the presence or absence of base wear needn't signify anything. Now that I'm home, I can report it is 5 inches (12.5 cm) tall by 5 inches wide. And the base in its original state (i.e., minus scratches) was polished as smoothly as the other surfaces. I actually like the wide latticino effect of the bowl - it reminds me of DNA strands. For comparison's sake, posted here is a picture of a tiny, more finely stranded piece with mint green bands that I love. The glass is thinner than that of the jar, and it has a rough pontil (not ground).
Thanks for all the responses,
Charles.