Yikes! That's a very blatant mistake and not only one person screwed up, but arguably at least 7 people in the later part of the grading operation missed this too. Reading this article below, one would think that at least one of the eight or nine people handling the card would have caught this obvious error - a 1887 card with a glossy finish? The most disturbing thing is that the "Verification Stage (2) Person" is supposed to catch these types of errors.
The Sticker Stage Person
The Spec Department Person
At least two, maybe three Grading Persons
The PSA Labeling Department Person
The Sealing Department Person
Verification Stage (1) Person
Verification Stage (2) Person
http://www.psacard.com/Services/PSAGradingProcess/