Erase Border (same width)

Press [Edit / Stamp].

Press [Erase].

Press [Erase Center / Border].

Press [Erase Border].

Press [Same Width].

Specify an erase border width with [] and [].

Pressing [] or [] changes the width in increments of 1 mm (0.1 inch). Pressing and holding down the relevant key changes the width in increments of 10 mm (1 inch).

Press [OK] twice.