Epson ColorWorks C6500Au Technical Reference Manual page 233

Continuous Label (Black Mark)
Waste part
2.0 mm
Backing paper width
Waste part
Label width*
2.0 mm
Paper feed direction
Print start position
Cut position
2 mm
Printable Area
Label area
Backing paper
Black mark position
(Reverse side)
* User setting items
Appendix
233