Display Screen or Portion Thereof with a Gaming Machine Interface

FIG. 1 is a front view of a display screen or portion thereof with a gaming machine interface showing our new design;

FIG. 2 is a front view of a second embodiment thereof;

FIG. 3 is a front view of a third embodiment thereof

FIG. 4 is a front view of a fourth embodiment thereof;

FIG. 5 is a front view of a fifth embodiment thereof;

FIG. 6 is a front view of a sixth embodiment thereof; and,

FIG. 7 is a front view of a seventh embodiment thereof.

The rectangular broken-line perimeter illustrates a display screen or portion thereof and forms no part of the claimed design. The remaining broken lines represent elements of the gaming machine interface that form no part of the claimed design.