The hologram stamp is the hardest to see of the stamps used by Corning Ware and best seen when tilted to the right and in the right light(see added photo from blog). See all 12 photos please which were taken in my sunroom. These bowls are not mint but probably as close as you will find, unless you can find one still in a box new. To my knowledge any stray marks or scratches have been photographed. I have pictures for reference from Corning Ware 411 Blogs and rarest 8 corning ware patterns at rarest. Org.