Another one, this one from the corner of the last of several make ready sheets. Those are sheets used for press adjustment before the actual production starts. The last one usually gets a corner torn off to mark where the setup pieces end and the product begins.
The blue is printed right into the torn area, showing it was torn before being printed. (I also saw the whole sheet and was there when it was cut. I couldn't afford the sheet, but did buy this card. )
Steve B