I agree. But this is unusual colour for stemware and no decoration? I think the colours led to the Kolo suggestion rather than the form.
I wonder also about the rim. This shape is fairly impractical so most versions I know are for decorative purposes, Whoever the manufacturer is you would think that (if it were early) there would be enamel decoration (?) like your saleroom example..
In Belgian glass we often see enamel or cold-paint which has been damaged in use and then the remaining enamel has been stripped to leave an object clean (but not correct).
"It is a puzzlement"!