The “x” varieties have vertically rippled gum, and the “y” varietiy has horizontally rippled gum.

Those with “X” suffixes feature a normal swastika watermark — when viewed from the rear, the legs of the swastika point in a counterclockwise direction. The “Y” suffixes feature the rarer reversed swastika watermark, with the legs of the swastika pointed in a clockwise direction when viewed from the rear.

The “x” varieties have vertically rippled gum, and the “y” varietiy has horizontally rippled gum.

Those with “X” suffixes feature a normal swastika watermark — when viewed from the rear, the legs of the swastika point in a counterclockwise direction. The “Y” suffixes feature the rarer reversed swastika watermark, with the legs of the swastika pointed in a clockwise direction when viewed from the rear.