Probably a rhetorical question
 

Why isn't this a Boston Store blank back? Or Weil Baking? Or Standard Biscuit?

https://i.ebayimg.com/images/g/cqcAA...F9/s-l1600.jpg

Or E-Unc? or D-Unc? or H-Unc?

Probably because the submitter sent it in with that set name?

psa
 

Perhaps PSA should have asked that question before they graded it.

I have generally classified those as E135 blank backs. Just seemed like the right thing to do.