It's hard to be critical of this photo because it's such a nice glass, but it is a classic example of reflected glare from the light source.
This photographer
did everything right: a beautiful old glass in mint condition, a
nice pleasing and clean background, tight focus on the
glass, and the image is as crisp as you please. The
only problem is that the light being used to illuminate the
glass is being reflected right back into the camera lens and
creating the two ugly highlights.
I'm not quite sure how
this photo was set up but my guess would be that the glass is
lying on its side on the blue background, the camera is mounted
directly overhead, and the light source is a double fluorescent strip
light overhead.